Today s Topics. Scroll views Table views. UITableViewController Table view cells. Displaying data Controlling appearance & behavior
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- Susan Watson
- 5 years ago
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1 Today s Topics Scroll views Table views Displaying data Controlling appearance & behavior UITableViewController Table view cells
2 Scroll Views
3 UIScrollView For displaying more content than can fit on the screen
4 UIScrollView For displaying more content than can fit on the screen Handles gestures for panning and zooming
5 UIScrollView For displaying more content than can fit on the screen Handles gestures for panning and zooming Noteworthy subclasses: UITableView and UITextView
6 Scrolling Examples
7 Scrolling Examples
8 Scrolling Examples
9 Content Size
10 Content Size contentsize.width contentsize.height
11 Content Inset contentsize.width contentinset.top contentsize.height contentinset.bottom
12 Content Inset
13 Content Inset
14 Content Inset
15 Content Inset contentinset.top
16 Content Inset contentinset.top
17 Content Inset contentinset.top contentinset.bottom
18 Scroll Indicator Insets
19 Scroll Indicator Insets
20 Scroll Indicator Insets
21 Scroll Indicator Insets scrollindicatorinsets.top
22 Content Offset
23 Content Offset
24 Content Offset
25 contentsize.width contentinset.top contentsize.height contentinset.left contentinset.right contentinset.bottom
26
27 contentoffset.y contentoffset.x
28
29
30 contentoffset.x (-contentinset.left) contentoffset.y (-contentinset.top)
31 Using a Scroll View
32 Using a Scroll View Create with the desired frame CGRect frame = CGRectMake(0, 0, 200, 200); scrollview = [[UIScrollView alloc] initwithframe:frame];
33 Using a Scroll View Create with the desired frame CGRect frame = CGRectMake(0, 0, 200, 200); scrollview = [[UIScrollView alloc] initwithframe:frame]; Add subviews (frames may extend beyond scroll view bounds) frame = CGRectMake(0, 0, 500, 500); myimageview = [[UIImageView alloc] initwithframe:frame]; [scrollview addsubview:myimageview];
34 Using a Scroll View Create with the desired frame CGRect frame = CGRectMake(0, 0, 200, 200); scrollview = [[UIScrollView alloc] initwithframe:frame]; Add subviews (frames may extend beyond scroll view bounds) frame = CGRectMake(0, 0, 500, 500); myimageview = [[UIImageView alloc] initwithframe:frame]; [scrollview addsubview:myimageview]; Set the content size scrollview.contentsize = CGSizeMake(500, 500);
35 Extending Scroll View Behavior Applications often want to know about scroll events
36 Extending Scroll View Behavior Applications often want to know about scroll events When the scroll offset is changed
37 Extending Scroll View Behavior Applications often want to know about scroll events When the scroll offset is changed When dragging begins & ends
38 Extending Scroll View Behavior Applications often want to know about scroll events When the scroll offset is changed When dragging begins & ends When deceleration begins & ends
39 Extending with a Subclass Create a subclass Override methods to customize behavior
40 Extending with a Subclass Create a subclass Override methods to customize behavior Issues with this approach
41 Extending with a Subclass Create a subclass Override methods to customize behavior Issues with this approach Application logic and behavior is now part of a View class
42 Extending with a Subclass Create a subclass Override methods to customize behavior Issues with this approach Application logic and behavior is now part of a View class Tedious to write a one-off subclass for every scroll view instance
43 Extending with a Subclass Create a subclass Override methods to customize behavior Issues with this approach Application logic and behavior is now part of a View class Tedious to write a one-off subclass for every scroll view instance Your code becomes tightly coupled with superclass
44 Extending with Delegation Delegate is a separate object Clearly defined points of responsibility Change behavior Customize appearance Loosely coupled with the object being extended
45 UIScrollView Delegate
46 UIScrollView UIScrollViewDelegate<NSObject>
47 UIScrollView
48 UIScrollView // Respond to interesting events - (void)scrollviewdidscroll:(uiscrollview *)scrollview;
49 UIScrollView // Respond to interesting events - (void)scrollviewdidscroll:(uiscrollview *)scrollview;... // Influence behavior - (BOOL)scrollViewShouldScrollToTop:(UIScrollView
50 Implementing a Delegate
51 Implementing a Delegate Conform to the delegate MyController : NSObject <UIScrollViewDelegate>
52 Implementing a Delegate Conform to the delegate MyController : NSObject <UIScrollViewDelegate> Implement all required methods and any optional methods - (void)scrollviewdidscroll:(uiscrollview *)scrollview { // Do something in response to the new scroll position if (scrollview.contentoffset...) { } }
53 Zooming with a Scroll View
54 Zooming with a Scroll View Set the minimum, maximum, initial zoom scales scrollview.maximumzoomscale = 2.0; scrollview.minimumzoomscale = scrollview.size.width / myimage.size.width;
55 Zooming with a Scroll View Set the minimum, maximum, initial zoom scales scrollview.maximumzoomscale = 2.0; scrollview.minimumzoomscale = scrollview.size.width / myimage.size.width; Implement delegate method for zooming - (UIView *)viewforzoominginscrollview:(uiview *)view { return someviewthatwillbescaled; }
56 Set Zoom Scale - (void)setzoomscale:(float)scale animated:(bool);
57 Set Zoom Scale - (void)setzoomscale:(float)scale animated:(bool);
58 Set Zoom Scale - (void)setzoomscale:(float)scale animated:(bool);
59 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
60 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
61 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
62 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
63 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
64 Zoom to Rect - (void)zoomtorect:(cgrect)rect animated:(bool);
65 Table Views
66 Table Views Display lists of content Single column, multiple rows Vertical scrolling Large data sets Powerful and ubiquitous in iphone applications
67 Table View Styles
68 Table View Styles UITableViewStylePlain
69 Table View Styles UITableViewStylePlain UITableViewStyleGrouped
70 Table View Anatomy Plain Style
71 Table Header Table View Anatomy Plain Style
72 Table View Anatomy Plain Style Table Header Table Footer
73 Table View Anatomy Plain Style Table Header Section Table Footer
74 Table View Anatomy Plain Style Table Header Section Header Section Table Footer
75 Table View Anatomy Plain Style Table Header Section Header Section Footer Section Table Footer
76 Table View Anatomy Plain Style Table Header Section Header Table Cell Section Footer Section Table Footer
77 Table View Anatomy Plain Style Table Header Section Header Table Cell Section Footer Section Table Footer
78 Table View Anatomy Grouped Style Table Header Section Header Table Cell Section Footer Section Table Footer
79 Using Table Views Displaying your data in the table view Customizing appearance & behavior
80 Displaying Data in a Table View
81 A Naïve Solution
82 A Naïve Solution Table views display a list of data, so use an array [mytableview setlist:mylistofstuff];
83 A Naïve Solution Table views display a list of data, so use an array [mytableview setlist:mylistofstuff]; Issues with this approach
84 A Naïve Solution Table views display a list of data, so use an array [mytableview setlist:mylistofstuff]; Issues with this approach All data is loaded upfront
85 A Naïve Solution Table views display a list of data, so use an array [mytableview setlist:mylistofstuff]; Issues with this approach All data is loaded upfront All data stays in memory
86 A More Flexible Solution Another object provides data to the table view Not all at once Just as it s needed for display Like a delegate, but purely data-oriented
87 UITableViewDataSource
88 UITableViewDataSource Provide number of sections and rows // Optional method, defaults to 1 if not implemented - (NSInteger)numberOfSectionsInTableView:(UITableView *)table; // Required method - (NSInteger)tableView:(UITableView *)tableview numberofrowsinsection:(nsinteger)section;
89 UITableViewDataSource Provide number of sections and rows // Optional method, defaults to 1 if not implemented - (NSInteger)numberOfSectionsInTableView:(UITableView *)table; // Required method - (NSInteger)tableView:(UITableView *)tableview numberofrowsinsection:(nsinteger)section; Provide cells for table view as needed // Required method - (UITableViewCell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath;
90 Datasource Message Flow Datasource
91 Datasource Message Flow numberofsectionsintableview: How many sections? Datasource
92 Datasource Message Flow numberofsectionsintableview: Datasource 5
93 Datasource Message Flow Datasource
94 Datasource Message Flow tableview:numberofrowsinsection: How many rows in section 0? Datasource
95 Datasource Message Flow tableview:numberofrowsinsection: Datasource 1
96 Datasource Message Flow Datasource
97 Datasource Message Flow tableview:cellforrowatindexpath: What to display at section 0, row 0? Datasource
98 Datasource Message Flow tableview:cellforrowatindexpath: Cell with text John Appleseed Datasource
99 NSIndexPath Generic class in Foundation Path to a specific node in a tree of nested arrays
100 NSIndexPath Generic class in Foundation Path to a specific node in a tree of nested arrays
101 NSIndexPath and Table Views Cell location described with an index path Section index + row index
102 NSIndexPath and Table Views Cell location described with an index path Section index + row index Category on NSIndexPath with helper NSIndexPath (UITableView) + (NSIndexPath *)indexpathforrow:(nsuinteger)row NSUInteger NSUInteger
103 Single Section Table View
104 Single Section Table View Return the number of rows - (NSInteger)tableView:(UITableView *)tableview numberofrowsinsection:(nsinteger)section { return [mystrings count]; }
105 Single Section Table View Return the number of rows - (NSInteger)tableView:(UITableView *)tableview numberofrowsinsection:(nsinteger)section { return [mystrings count]; } Provide a cell when requested - (UITableViewCell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { UITableViewCell *cell =...; cell.textlabel.text = [mystrings objectatindex:indexpath.row] return [cell autorelease]; }
106 Cell Reuse
107 Cell Reuse When asked for a cell, it would be expensive to create a new cell each time.
108 Cell Reuse When asked for a cell, it would be expensive to create a new cell each time. - (UITableViewCell *)dequeuereusablecellwithidentifier: (NSString *)identifier;
109 Cell Reuse When asked for a cell, it would be expensive to create a new cell each time. - (UITableViewCell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { UITableViewCell *cell = [tableview dequeuereusablecellwithidentifier:@ MyIdentifier ]; if (cell == nil) { cell = [[[UITableViewCell alloc] initwithstyle:... reuseidentifier:@ MyIdenifier ] autorelease]; } cell.text = [mystrings objectatindex:indexpath.row] } return cell;
110 Triggering Updates When is the datasource asked for its data?
111 Triggering Updates When is the datasource asked for its data? When a row becomes visible
112 Triggering Updates When is the datasource asked for its data? When a row becomes visible When an update is explicitly requested by calling -reloaddata - (void)viewwillappear:(bool)animated { [super viewwillappear:animated]; } [self.tableview reloaddata];
113 Section and Row Reloading
114 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation;
115 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)deletesections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation;
116 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)deletesections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)reloadsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation;
117 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)deletesections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)reloadsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)insertrowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation;
118 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)deletesections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)reloadsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)insertrowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation; - (void)deleterowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation;
119 Section and Row Reloading - (void)insertsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)deletesections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)reloadsections:(nsindexset *)sections withrowanimation:(uitableviewrowanimation)animation; - (void)insertrowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation; - (void)deleterowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation; - (void)reloadrowsatindexpaths:(nsarray *)indexpaths withrowanimation:(uitableviewrowanimation)animation;
120 Additional Datasource Methods Titles for section headers and footers Allow editing and reordering cells
121 Appearance & Behavior
122 UITableView Delegate Customize appearance and behavior Keep application logic separate from view Often the same object as datasource
123 Table View Appearance & Behavior
124 Table View Appearance & Behavior Customize appearance of table view cell - (void)tableview:(uitableview *)tableview willdisplaycell:(uitableviewcell *)cell forrowatindexpath:(nsindexpath *)indexpath;
125 Table View Appearance & Behavior Customize appearance of table view cell - (void)tableview:(uitableview *)tableview willdisplaycell:(uitableviewcell *)cell forrowatindexpath:(nsindexpath *)indexpath; Validate and respond to selection changes - (NSIndexPath *)tableview:(uitableview *)tableview willselectrowatindexpath:(nsindexpath *)indexpath; - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath;
126 Row Selection in Table Views In iphone applications, rows rarely stay selected Selecting a row usually triggers an event
127 Row Selection in Table Views In iphone applications, rows rarely stay selected Selecting a row usually triggers an event
128 Persistent Selection
129 Persistent Selection
130 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {
131 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents
132 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row 56
133 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row id objecttodisplay = [myobjects objectatindex:row];
134 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row id objecttodisplay = [myobjects objectatindex:row]; // Create a new view controller and pass it along
135 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row id objecttodisplay = [myobjects objectatindex:row]; // Create a new view controller and pass it along MyViewController *myviewcontroller =...;
136 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row id objecttodisplay = [myobjects objectatindex:row]; // Create a new view controller and pass it along MyViewController *myviewcontroller =...; myviewcontroller.object = objecttodisplay; 56
137 Responding to Selection // For a navigation hierarchy... - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath { // Get the row and the object it represents NSUInteger row = indexpath.row id objecttodisplay = [myobjects objectatindex:row]; // Create a new view controller and pass it along MyViewController *myviewcontroller =...; myviewcontroller.object = objecttodisplay; } [self.navigationcontroller pushviewcontroller:myviewcontroller animated:yes];
138 Altering or Disabling Selection - (NSIndexPath *)tableview:(uitableview *)tableview willselectrowatindexpath:(nsindexpath *)indexpath { // Don t allow selecting certain rows? if (indexpath.row ==...) { return nil; } else { return indexpath; } }
139 UITableViewController
140 UITableViewController
141 UITableViewController Convenient starting point for view controller with a table view Table view is automatically created Controller is table view s delegate and datasource
142 UITableViewController Convenient starting point for view controller with a table view Table view is automatically created Controller is table view s delegate and datasource Takes care of some default behaviors Calls -reloaddata the first time it appears Deselects rows when user navigates back Flashes scroll indicators
143 Table View Cells
144 Designated Initializer
145 Designated Initializer - (id)initwithframe:(cgrect)frame reuseidentifier:(nsstring *)reuseidentifier;
146 Designated Initializer - (id)initwithframe:(cgrect)frame reuseidentifier:(nsstring *)reuseidentifier; DEPRECATED - (id)initwithstyle:(uitableviewcellstyle)style reuseidentifier:(nsstring *)reuseidentifier;
147 Cell Styles
148 Cell Styles UITableViewCellStyleDefault
149 Cell Styles UITableViewCellStyleDefault UITableViewCellStyleSubtitle
150 Cell Styles UITableViewCellStyleDefault UITableViewCellStyleSubtitle UITableViewCellStyleValue1
151 Cell Styles UITableViewCellStyleDefault UITableViewCellStyleSubtitle UITableViewCellStyleValue1 UITableViewCellStyleValue2
152 Basic properties UITableViewCell has an image view and one or two text labels
153 Basic properties UITableViewCell has an image view and one or two text labels cell.imageview.image = [UIImage imagenamed:@ vitolidol.png ]; cell.textlabel.text Vitol Idol ; cell.detailtextlabel.text Billy Idol ;
154 Accessory Types // UITableView delegate method - (UITableViewCellAccessoryType)tableView:(UITableView *)table accessorytypeforrowwithindexpath:(nsindexpath *)indexpath;
155 Accessory Types // UITableView delegate method - (UITableViewCellAccessoryType)tableView:(UITableView *)table accessorytypeforrowwithindexpath:(nsindexpath *)indexpath; UITableViewCellAccessoryDisclosureIndicator
156 Accessory Types // UITableView delegate method - (UITableViewCellAccessoryType)tableView:(UITableView *)table accessorytypeforrowwithindexpath:(nsindexpath *)indexpath; UITableViewCellAccessoryDisclosureIndicator UITableViewCellAccessoryDetailDisclosureButton
157 Accessory Types // UITableView delegate method - (UITableViewCellAccessoryType)tableView:(UITableView *)table accessorytypeforrowwithindexpath:(nsindexpath *)indexpath; UITableViewCellAccessoryDisclosureIndicator UITableViewCellAccessoryDetailDisclosureButton - (void)tableview:(uitableview *)tableview accessorybuttontappedforrowwithindexpath:(nsindexpath *)indexpath { // Only for the blue disclosure button NSUInteger row = indexpath.row;... }
158 Accessory Types // UITableView delegate method - (UITableViewCellAccessoryType)tableView:(UITableView *)table accessorytypeforrowwithindexpath:(nsindexpath *)indexpath; UITableViewCellAccessoryDisclosureIndicator UITableViewCellAccessoryDetailDisclosureButton UITableViewCellAccessoryCheckmark - (void)tableview:(uitableview *)tableview accessorybuttontappedforrowwithindexpath:(nsindexpath *)indexpath { // Only for the blue disclosure button NSUInteger row = indexpath.row;... }
159 Customizing the Content View For cases where a simple image + text cell doesn t suffice UITableViewCell has a content view property Add additional views to the content view
160 Customizing the Content View For cases where a simple image + text cell doesn t suffice UITableViewCell has a content view property Add additional views to the content view - (UITableViewCell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath { UITableViewCell *cell =...; CGRect frame = cell.contentview.bounds; UILabel *mylabel = [[UILabel alloc] initwithframe:frame]; mylabel.text =...; [cell.contentview addsubview:mylabel]; } [mylabel release];
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