아이폰 앱 개발 팁(7) : Stanford Lecture #8

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> Stanford Lecture #8

* Using a Scroll View

// Create with the desired frame

CGRect frame = CGRectMake(0, 0, 200, 200);

// Add subviews

frame = CGRectMake(0, 0, 500, 500);

myImageView = [[UIImageView alloc] initWithFrame:frame];

[scrollView addSubview:myImageView];

// Set the content size

scrollView.contentSize = CGSizeMake(500, 500);

* UIScrollView delegate

@protocol UIScrollViewDelegate<NSObject>

@optional

- (void)scrollViewDidScroll:(UIScrollView *)scrollView;

...

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;

@end

* Zooming with a Scroll View

scrollView.maximumZoomScale = 2.0;

scrollView.minimumZoomScale = scrollView.size.width / myImage.size.width;

- (UIView *)viewForZoomingInScrollView:(UIView *)view{

return someViewThatWillBeScaled;

}

* Provide number of sections and rows

- (NSInteger)numberOfSectionsInTableView:(UITableView *)table;

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;

* Provide cells for table view as needed

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;

* Category on NSIndexPath with helper methods

+ (NSIndexPath *)indexPathForRow:(NSUInteger)row inSection:(NSUInteger)section;

@property(nonatomic,readonly) NSUInteger section;

@property(nonatomic,readonly) NSUInteger row;

@end

* Cell reuse

- (UITableViewCell *)dequeueReusableCellWithIdentifier:(NSString *)identifier;

* Triggering updates

- (void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[self.tableView reloadData];

}

* 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;

* Responding to selection

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

NSUInteger row = indexPath.row;

id objectToDisplay = [myObjects objectAtIndex:row];

MyViewController *myViewController = ...;

myViewController.object = objectToDisplay;

[self.navigationController pushViewController:myViewController animated:YES];

}

* Altering or disabling selection

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath{

if(indexPath.row == ...){

return nil;

}else{

return indexPath;

}

}

* Accessory types

- (UITableViewCellAccessoryType)tableView:(UITableView *)table accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath;

UITableViewCellAccessoryDisclosureIndicator

UITableViewCellAccessoryDetailDisclosureButton

UITableViewCellAccessoryCheckmark

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{

NSUInteger row = indexPath.row;

...

}

* 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];

}

* Custom row heights

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

NSString *text = ...;

UIFont *font = [UIFont systemFontOfSize:...];

CGSize withinSize = CGSizeMake(tableView.width, 1000];

CGSize size = [text sizeWithFont:font constrainedToSize:withinSize lineBreakMode:UILineBreakModeWordWrap];

return size.height + somePadding;

}