IOS各种手势的使用

#import "HYBRootViewController.h"

@interface HYBRootViewController () <UIGestureRecognizerDelegate>

@property (nonatomic, retain) UIImageView *imageView;

- (void)imageViewTap:(UITapGestureRecognizer *)sender;

@end

@implementation HYBRootViewController

@synthesize imageView = _imageView;

- (void)viewDidLoad {
  [super viewDidLoad];
  
  self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(50, 100, 200, 200)];
  self.imageView.image = [UIImage imageNamed:@"1.png"];
  self.imageView.userInteractionEnabled = YES; // Default is NO
  [self.view addSubview:self.imageView];
  
  // 添加点击手势
  // 所有手势的父类 UIGestureReconizer
  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                 initWithTarget:self action:@selector(imageViewTap:)];
  //tap.numberOfTapsRequired = 2; // 要求双击才触发事件
  tap.numberOfTouchesRequired = 2; // 要求两个手指同时触摸才触发事件
  // 将点击手势添加到imageView上
  [self.imageView addGestureRecognizer:tap];
  tap.delegate = self;
  [tap release];
  
  //
  // 添加移动手势
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]
                                 initWithTarget:self action:@selector(imageViewPaned:)];
  [self.imageView addGestureRecognizer:pan];
  pan.delegate = self;
  [pan release];
  
  //
  // 添加缩放手势
  UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]
                                   initWithTarget:self action:@selector(imageViewPinched:)];
  [self.imageView addGestureRecognizer:pinch];
  pinch.delegate = self;
  [pinch release];
  
  // 旋转手势
  UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]
                                           initWithTarget:self action:@selector(imageViewRotated:)];
  [self.imageView addGestureRecognizer:rotation];
  rotation.delegate = self;
  [rotation release];
  
	return;
}

- (void)dealloc {
  self.imageView = nil;
  
  [super dealloc];
  return;
}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  return;
}

- (void)imageViewTap:(UITapGestureRecognizer *)sender {
  self.view.backgroundColor = [UIColor greenColor];
  return;
}

// 此方法在移动过程中时时调用
// 移动手势
- (void)imageViewPaned:(UIPanGestureRecognizer *)sender {
  NSLog(@"paned");
  // 这个view是这个移动手势被回到的视图上的view,这里就是self.imageView
  //sender.view
  // 拿到父 视图imageView被点击的点在Self.view上的位置
  CGPoint pt = [sender translationInView:self.view];

  sender.view.center = CGPointMake(sender.view.center.x + pt.x, sender.view.center.y + pt.y);
  // 重置手势获取的偏移量
  // 这一步很重要
  [sender setTranslation:CGPointZero inView:self.view];
  
  return;
}

// 缩放手势
// 此方法在缩放过程中会被调用多次
- (void)imageViewPinched:(UIPinchGestureRecognizer *)sender {
  // 很重要的一个属性scale，会被捕获到缩放的倍数
  // 参数一：原来的transform
  // 参数二：水平方向缩放的倍数
  // 参数三：垂直方向缩放的倍数
  // CGAffineTansform 仿射变换矩阵（矩阵中放置view的缩放倍数，旋转角度，x,y坐标等参数）
  // 将x,y方向的缩放倍数传给transform
  sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.scale, sender.scale);
  // 会被多次调用这个方法，所以每次都要重置缩放倍数为原始倍数
  sender.scale = 1.0f;

  return;
}

// 旋转手势
- (void)imageViewRotated:(UIRotationGestureRecognizer *)sender {
  // 改变矩阵的角度参数
  sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);
  // 重置角度，因为在这个方法在旋转时会时时被调用
  sender.rotation = 0.0f;
  return;
}

// 设置同时可以有两个手势同时识别
// 基本上是同时识别两个,默认为NO
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
  shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
  return YES;
}

@end