iOS显示UIImage全屏，缩放（捏和双击）启用
我有一个UIImage从UIImagePickerController摄像头捕获。
现在用户点击它之后，我希望它能够全屏显示，并且能够使用捏手势以及双击手势放大和缩小特定区域。 换句话说，我想模仿iOS的默认图像浏览器。
我用UIImageView显示捕获的图像：
self.imageView.contentMode = UIViewContentModeScaleAspectFill;
这使得图像全屏。 但是，我如何实现缩放。 我需要使用手势识别器从头开始吗？ 或者，也许有一个默认的图像显示视图与所有实现我不知道的？
我已经为我的应用程序创build了这个效果，不要忘记设置您的滚动视图的委托。
代码.h文件
#import <UIKit/UIKit.h> @interface ImageViewerController : UIViewController<UIScrollViewDelegate> // The scroll view used for zooming. @property (weak, nonatomic) IBOutlet UIScrollView *scrollView; // The image view that displays the image. @property (weak, nonatomic) IBOutlet UIImageView *imageView; // The image that will be shown. @property (strong, nonatomic) NSString *imageUrlString; @end
代码.m
#import "ImageViewerController.h" @interface HNImageViewerController () - (IBAction)handleSingleTap:(UIButton*)tapGestureRecognizer; @end @implementation ImageViewerController - (void)viewDidLoad { [super viewDidLoad]; [self.imageView setImage:[UIImage imageNamed:@"placeholder-image"]]; self.scrollView.delegate=self; } - (BOOL)prefersStatusBarHidden { return YES; } #pragma mark - UIScrollViewDelegate methods - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return self.imageView; } - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate { if (self.scrollView.zoomScale == self.scrollView.minimumZoomScale) { [self dismissViewControllerAnimated:YES completion:nil]; } } #pragma mark - Private methods - (IBAction)handleSingleTap:(UIButton *)tapGestureRecognizer { [self dismissViewControllerAnimated:YES completion:nil]; }
这很容易实现：
- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer;
接着：
- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer { recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale); recognizer.scale = 1; }