UIImageView响应点击事件

最新推荐文章于 2016-07-18 13:53:00 发布

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本文介绍在iOS开发中处理UIImageView点击事件的两种方法：使用UITapGestureRecognizer和处理touchesBegan事件。此外，还介绍了如何通过事件源来识别不同的UIImageView实例。

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方法1：

UIImageView *testImageView = [[UIImageView alloc] init......................

testImageView.userInteractionEnabled = YES;

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];

[testImageViewaddGestureRecognizer:singleTap];

[singleTap release];

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer {

//do some method.....

}

方法2：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

UITouch *touch = [[event allTouches] anyObject];

if ([touch view] != UIImageView)

{

//do some method.....

}

只要在上面的方法中加入处理事件就OK了。

======================

获取点击事件来源

1.绑定点击事件

[BTBook setUserInteractionEnabled:YES];

[BTBook setTag:1000];

UITapGestureRecognizer *singleTap3 = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(GoThisPic:)];

[BTBook addGestureRecognizer:singleTap3];

[singleTap3 release];

2,获得事件源

-(void)GoThisPic:(UIGestureRecognizer *)gestureRecognizer

{

UIImageView *view = [gestureRecognizer view];

int tagvalue = view.tag;

}

当有多个同类型点击事件时，可以利用事件源得到对应的view。

例如：

int photosCount = [tphotosList count];

for (int i=0; i<photosCount; i++) {

NSString *photoUrl = [tphotosList objectAtIndex:i];

//66.67 * 4

int linenum = i / 4;

int rownum = i % 4;

EGOImageView *egoivVgirlPhoto = [[EGOImageView alloc] initWithPlaceholderImage:[UIImage imageNamed:@"loading.png"]];

[egoivVgirlPhoto setTag:i];

[egoivVgirlPhoto setFrame:CGRectMake(10+66.67*rownum, 30+10+66.67*linenum, 65, 65)];

[egoivVgirlPhoto setImageURL:[NSURL URLWithString:photoUrl]];

[egoivVgirlPhoto setUserInteractionEnabled:YES];

UITapGestureRecognizer *touchVgirlPhotoGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touchPhotoAction:)];

[egoivVgirlPhoto addGestureRecognizer:touchVgirlPhotoGesture];

[touchVgirlPhotoGesture release];

[self.contentView addSubview:egoivVgirlPhoto];

[egoivVgirlPhoto release];

}

-(void)touchPhotoAction:(UIGestureRecognizer *)gestureRecognizer{

UIView *egoivPhotoView = [gestureRecognizer view];

int tPhotoIndex = [egoivPhotoView tag];

NSLog(@"tPhotoIndex: %d", tPhotoIndex);

if ([delegate respondsToSelector:@selector(doTouchPhoto:)]) {

[delegate doTouchPhoto:tPhotoIndex];

}