在我们开发项目中，经常会遇到点击图片查看图片大图，而且可以自由缩放的功能，今天就讲一讲它的实现方法
- (void)viewDidLoad {
[super viewDidLoad];
[selfsetUp];
[selfloadData];
// Do any additional setup after loading the view.
}
-(void)setUp{
_scrollView = [[UIScrollView alloc] init];
[_scrollView setTranslatesAutoresizingMaskIntoConstraints:NO];
_scrollView.backgroundColor = [UIColor blackColor];
_scrollView.maximumZoomScale = 5;
_scrollView.delegate = self;
[self.view addSubview:_scrollView];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[scrollView]-0-|" options:kNilOptions metrics:nil views:@{@"scrollView":_scrollView}]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[scrollView]-0-|" options:kNilOptions metrics:nil views:@{@"scrollView":_scrollView}]];
_imageView= [[UIImageViewalloc]init];
[_imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
_imageView.contentMode = UIViewContentModeScaleAspectFit;//缩放显示
_imageView.userInteractionEnabled = YES;
[_scrollView addSubview:_imageView];
[_scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[imageView(scrollView)]-0-|" options:kNilOptions metrics:nil views:@{@"imageView":_imageView,@"scrollView":_scrollView}]];
[_scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[imageView(scrollView)]-0-|" options:kNilOptions metrics:nil views:@{@"imageView":_imageView,@"scrollView":_scrollView}]];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismiss)];
[_imageView addGestureRecognizer:tap];
-(void)loadData{
if(_image){
_imageView.image = _image;
}
if(_imageUrl.length>0){
[_imageView setImageWithURL:[NSURL URLWithString:_imageUrl]];
}
}
-(void)dismiss{
[self dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark - UIScrollViewDelegate
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return _imageView;
}
是不是一目了然。简单粗暴，每天更新一个iOS小功能，喜欢的记得点赞加关注哦
