iOS開發中，除了有關觸摸的這組方法來控制用戶的手指觸控外，還可以用UIGestureRecognize的衍生類來進行判斷，方便了開發。
UIGestureRecognize的子類類別有以下幾種：

• UITapGestureRecognizer //輕拍識別器
• UIPinchGestureRecognizer //捏合識別器
• UIRotationGestureRecognizer //旋轉識別器
• UISwipeGestureRecognizer //掃動識別器
• UIPanGestureRecognizer //拖動識別器
• UILongPressGestureRecognizer //長按識別器

下面的例子我是用UIPinchGestureRecognizer和UIRotationGestureRecognizer通過手勢實現圖片旋轉和縮小放大。

ViewController.m中的代碼如下；

#import "ViewController.h"@interface ViewController ()@property(nonatomic,strong) UIImageView *imageView;
@property(nonatomic) CGFloat lastRotation;-(void)changeImageSize:(UIPinchGestureRecognizer *)recognizer;
-(void)rotateImage:(UIRotationGestureRecognizer *)rotateRecognizer;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor whiteColor];//在view上添加一個ImageViewUIImageView *image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Totoro"]];image.frame = CGRectMake(0, 0, 128, 128);self.imageView = image;self.imageView.center = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);[self.view addSubview:self.imageView];//添加捏合手勢識別器，changeImageSize:方法實現圖片的放大與縮小UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(changeImageSize:)];[self.view addGestureRecognizer:pinchRecognizer];//添加旋轉手勢識別器，rotateImage:方法實現圖片的旋轉UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotateImage:)];[self.view addGestureRecognizer:rotateRecognizer];}-(void)changeImageSize:(UIPinchGestureRecognizer *)recognizer
{CGRect frame = self.imageView.frame;//監聽兩手指滑動的距離，改變imageView的frameframe.size.width = recognizer.scale*128;frame.size.height = recognizer.scale*128;self.imageView.frame = frame;//保證imageView中心不動self.imageView.center =CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height/2);
}-(void)rotateImage:(UIRotationGestureRecognizer *)rotateRecognizer
{//改變imageView的角度，使圖片旋轉if ([rotateRecognizer state]==UIGestureRecognizerStateEnded) {self.lastRotation = 0.0;return;}CGAffineTransform currentTransform = self.imageView.transform;CGFloat rotation = 0.0 - (self.lastRotation - rotateRecognizer.rotation);CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);self.imageView.transform = newTransform;self.lastRotation = rotateRecognizer.rotation;
}@end

運行代碼，實現效果如下：

轉載于:https://www.cnblogs.com/ahtchxw/p/5466603.html

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