I am following Apple’s WWDC 2010 video on TVAnimationGestures (Advanced Table Views). They expand and collapse a table with a button as a subview of the header. Then later on in their lecture, they add a tap gesture to the whole view. I’d like to have that mechanism in place, but also have another button on the header that has a different action associated with it. However, in debug mode, it seems like whenever I press the header, even in the area where the button is that they created, when I get to the action method, the sender is always a UITapGestureRecognizer. So how would I add another button to get a new action, or in their code, distinguish between the button and the tap of the header. I copied and pasted their code below for that class.
/*
File: SectionHeaderView.m
Abstract: A view to display a section header, and support opening and closing a section.
Version: 1.1
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#import "SectionHeaderView.h"
#import <QuartzCore/QuartzCore.h>
@implementation SectionHeaderView
@synthesize titleLabel, disclosureButton, delegate, section;
+ (Class)layerClass {
return [CAGradientLayer class];
}
-(id)initWithFrame:(CGRect)frame title:(NSString*)title section:(NSInteger)sectionNumber delegate:(id <SectionHeaderViewDelegate>)aDelegate {
self = [super initWithFrame:frame];
if (self != nil) {
// Set up the tap gesture recognizer.
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleOpen:)];
[self addGestureRecognizer:tapGesture];
[tapGesture release];
delegate = aDelegate;
self.userInteractionEnabled = YES;
// Create and configure the title label.
section = sectionNumber;
CGRect titleLabelFrame = self.bounds;
titleLabelFrame.origin.x += 35.0;
titleLabelFrame.size.width -= 35.0;
CGRectInset(titleLabelFrame, 0.0, 5.0);
titleLabel = [[UILabel alloc] initWithFrame:titleLabelFrame];
titleLabel.text = title;
titleLabel.font = [UIFont boldSystemFontOfSize:17.0];
titleLabel.textColor = [UIColor whiteColor];
titleLabel.backgroundColor = [UIColor clearColor];
[self addSubview:titleLabel];
// Create and configure the disclosure button.
disclosureButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
disclosureButton.frame = CGRectMake(0.0, 5.0, 35.0, 35.0);
[disclosureButton setImage:[UIImage imageNamed:@"carat.png"] forState:UIControlStateNormal];
[disclosureButton setImage:[UIImage imageNamed:@"carat-open.png"] forState:UIControlStateSelected];
[disclosureButton addTarget:self action:@selector(toggleOpen:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:disclosureButton];
// Set the colors for the gradient layer.
static NSMutableArray *colors = nil;
if (colors == nil) {
colors = [[NSMutableArray alloc] initWithCapacity:3];
UIColor *color = nil;
color = [UIColor colorWithRed:0.82 green:0.84 blue:0.87 alpha:1.0];
[colors addObject:(id)[color CGColor]];
color = [UIColor colorWithRed:0.41 green:0.41 blue:0.59 alpha:1.0];
[colors addObject:(id)[color CGColor]];
color = [UIColor colorWithRed:0.41 green:0.41 blue:0.59 alpha:1.0];
[colors addObject:(id)[color CGColor]];
}
[(CAGradientLayer *)self.layer setColors:colors];
[(CAGradientLayer *)self.layer setLocations:[NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:0.48], [NSNumber numberWithFloat:1.0], nil]];
}
return self;
}
-(IBAction)toggleOpen:(id)sender {
[self toggleOpenWithUserAction:YES];
}
-(void)toggleOpenWithUserAction:(BOOL)userAction {
// Toggle the disclosure button state.
disclosureButton.selected = !disclosureButton.selected;
// If this was a user action, send the delegate the appropriate message.
if (userAction) {
if (disclosureButton.selected) {
if ([delegate respondsToSelector:@selector(sectionHeaderView:sectionOpened:)]) {
[delegate sectionHeaderView:self sectionOpened:section];
}
}
else {
if ([delegate respondsToSelector:@selector(sectionHeaderView:sectionClosed:)]) {
[delegate sectionHeaderView:self sectionClosed:section];
}
}
}
}
- (void)dealloc {
[titleLabel release];
[disclosureButton release];
[super dealloc];
}
@end
If you want to not activate the gesture recognizer for certain controls you should implement the (BOOL)gestureRecognizer: shouldReceiveTouch: delegate method of UIGestureRecognizer, for example the following will ignore the event from the recognizer for any button that is pressed
hope it helps