iOS UIImageView 添加 UITapGestureRecognizer 事件

一 问题描述

做照片放大缩小功能，添加UITapGestureRecognizer 事件后，点击图片没有事件相应。

二 解决方法

//设置imageView setUserInteractionEnable 属性
[self.imageView setUserInteractionEnabled:YES];

三 图片放大缩小代码

//=====声明参数部分=======
/**阴影按钮*/
@property (nonatomic, weak) UIButton *cover;

/**记录头像原始尺寸*/
@property (nonatomic, assign)CGRect oldIconBtnFrame;



//=====设置 UITapGestureRecognizer 部分=======
[_showFrontImageView setUserInteractionEnabled:YES];
UITapGestureRecognizer *singleTap =  [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapping)];
[singleTap setNumberOfTapsRequired:1];
[_showFrontImageView addGestureRecognizer:singleTap];



#pragma mark ---------------------图片放大--------------------


-(void)singleTapping
{
	
	if (self.cover!=nil) {
		[self smallImage];
	}else{
		[self bigImage];
	}
}



#pragma mark 大图
// 1.设置图片背景
-(void)bigImage{
	
	
	UIButton *cover = [[UIButton alloc]init];
	cover.frame= CGRectMake(0, 0, ScreenWidth, ScreenHeight);
	[cover setBackgroundColor:[UIColor blackColor]];
	
	// 先添加在赋值，因为该属性是weak 有可能释放
	[self.view addSubview:cover];
	
	self.cover=cover;
	cover.alpha=0.0;
	
	
	[self.view bringSubviewToFront:[_showFrontImageView superview]];
	[[_showFrontImageView superview] bringSubviewToFront:_showFrontImageView];
	
	// 保存旧值
	self.oldIconBtnFrame = _showFrontImageView.frame;
	
	// 设置监听
	[cover addTarget:self action:@selector(smallImage) forControlEvents:UIControlEventTouchUpInside];
	
	
	// 2.设置图片位置
	[UIView beginAnimations:nil context:nil];
	[UIView setAnimationDuration:1];
	[[self navigationController] setNavigationBarHidden:YES animated:YES];
	
	CGRect viewRect = self.view.frame;
	//    CGFloat iconW = viewRect.size.width;
	CGFloat iconW =ScreenWidth;
	
	CGFloat iconH =240;
	//    CGFloat iconH = self.bagImageView.image.size.height;
	CGFloat iconX = 0;
	CGFloat iconY = (viewRect.size.height-iconH)*0.5;
	
	_showFrontImageView.frame = CGRectMake(iconX, iconY, iconW, iconH);
	cover.alpha = 1.0;
	[UIView commitAnimations];
}


#pragma mark 缩小图片
-(void)smallImage
{
	[UIView animateWithDuration:1 animations:^{
		[[self navigationController] setNavigationBarHidden:NO animated:NO];
		_showFrontImageView.frame=self.oldIconBtnFrame;
		self.cover.alpha = 0;
	}completion:^(BOOL finished) {
		[self.cover removeFromSuperview];
		self.cover = nil;
		
		
	}];
}