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IOS各種手勢的使用
#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];
// 添加點擊手勢
// 所有手勢的父類 UIGestureReconizer
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(imageViewTap:)];
//tap.numberOfTapsRequired = 2; // 要求雙擊才觸發事件
tap.numberOfTouchesRequired = 2; // 要求兩個手指同時觸摸才觸發事件
// 將點擊手勢添加到imageView上
[self.imageView addGestureRecognizer:tap];
tap.delegate = self;
[tap release];
//
// 添加移動手勢
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]
initWithTarget:self action:@selector(imageViewPaned:)];
[self.imageView addGestureRecognizer:pan];
pan.delegate = self;
[pan release];
//
// 添加縮放手勢
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:@selector(imageViewPinched:)];
[self.imageView addGestureRecognizer:pinch];
pinch.delegate = self;
[pinch release];
// 旋轉手勢
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;
}
// 此方法在移動過程中時時調用
// 移動手勢
- (void)imageViewPaned:(UIPanGestureRecognizer *)sender {
NSLog(@"paned");
// 這個view是這個移動手勢被回到的視圖上的view,這裏就是self.imageView
//sender.view
// 拿到父 視圖imageView被點擊的點在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);
// 重置手勢獲取的偏移量
// 這一步很重要
[sender setTranslation:CGPointZero inView:self.view];
return;
}
// 縮放手勢
// 此方法在縮放過程中會被調用多次
- (void)imageViewPinched:(UIPinchGestureRecognizer *)sender {
// 很重要的一個屬性scale，會被捕獲到縮放的倍數
// 參數一：原來的transform
// 參數二：水平方向縮放的倍數
// 參數三：垂直方向縮放的倍數
// CGAffineTansform 仿射變換矩陣（矩陣中放置view的縮放倍數，旋轉角度，x,y坐標等參數）
// 將x,y方向的縮放倍數傳給transform
sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.scale, sender.scale);
// 會被多次調用這個方法，所以每次都要重置縮放倍數為原始倍數
sender.scale = 1.0f;
return;
}
// 旋轉手勢
- (void)imageViewRotated:(UIRotationGestureRecognizer *)sender {
// 改變矩陣的角度參數
sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);
// 重置角度，因為在這個方法在旋轉時會時時被調用
sender.rotation = 0.0f;
return;
}
// 設置同時可以有兩個手勢同時識別
// 基本上是同時識別兩個,默認為NO
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
@end
最後更新：2017-04-03 12:56:18