图片来自500px
文 || 張贺
点按（UITapGestureRecognizer）
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap)];
//设置代理
tap.delegate = self;
//2.添加手势
[self.imageV addGestureRecognizer:tap];
}
//3.实现手势方法
- (void)tap{
NSLog(@"%s",__func__);
}
#pragma mark - UIGestureRecognizerDelegate
//是否允许接收手指
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
//一张图片，左边不能点按，右边可以点按
CGPoint currentPoint = [touch locationInView:self.imageV];
if (currentPoint.x > self.imageV.bounds.size.width * 0.5) {
//右边，可以点击
return YES;
}else{
//左边，不可点击
return NO;
}
}
@end
长按（UILongPressGestureRecognizer）
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
//2.添加手势
[self.imageV addGestureRecognizer:longPress];
}
//3.实现手势方法
//长按时调用（当长按手指拖动的时候该方法会持续调用）
- (void)longPress:(UILongPressGestureRecognizer *)longPress{
/**
typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
UIGestureRecognizerStatePossible,
UIGestureRecognizerStateBegan,
UIGestureRecognizerStateChanged,
UIGestureRecognizerStateEnded,
UIGestureRecognizerStateCancelled,
UIGestureRecognizerStateFailed,
UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded
};
*/
switch (longPress.state) {
case UIGestureRecognizerStateBegan: NSLog(@"开始长按"); break;
case UIGestureRecognizerStateChanged: NSLog(@"长按拖动"); break;
case UIGestureRecognizerStateEnded: NSLog(@"结束长按"); break;
default: break;
}
}
@end
轻扫（UISwipeGestureRecognizer）
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
//设置清扫的方向,默认是Right
/**
typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
UISwipeGestureRecognizerDirectionRight = 1 << 0,
UISwipeGestureRecognizerDirectionLeft = 1 << 1,
UISwipeGestureRecognizerDirectionUp = 1 << 2,
UISwipeGestureRecognizerDirectionDown = 1 << 3
};
*/
swipe.direction = UISwipeGestureRecognizerDirectionLeft;
//2.添加手势
[self.imageV addGestureRecognizer:swipe];
//如果想实现向左向右都可以清扫，那么只能在创建一个手势
UISwipeGestureRecognizer *swipe2 = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
[self.imageV addGestureRecognizer:swipe2];
}
//3.实现手势方法
- (void)swipe:(UISwipeGestureRecognizer *)swipe{
//判断是向左轻扫还是向右轻扫
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"left");
}else if (swipe.direction == UISwipeGestureRecognizerDirectionRight){
NSLog(@"Right");
}
}
@end
拖动（UIPanGestureRecognizer）
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
//2.添加手势
[self.imageV addGestureRecognizer:pan];
}
//3.实现手势方法
-(void)pan:(UIPanGestureRecognizer *)pan{
//获取偏移量（相对于最原始的偏移量）
CGPoint transP = [pan translationInView:self.imageV];
//平移
self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform, transP.x, transP.y);
//让他相对于上一次（复位）
[pan setTranslation:CGPointZero inView:self.imageV];
}
@end
捏合（UIPinchGestureRecognizer）
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
//2.添加手势
[self.imageV addGestureRecognizer:pinch];
}
//3.实现手势方法
- (void)pinch:(UIPinchGestureRecognizer *)pinch{
//缩放
self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pinch.scale, pinch.scale);
//复位
[pinch setScale:1];
}
@end
旋转（UIRotationGestureRecognizer）
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1.创建手势
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGes:)];
//2.添加手势
[self.imageV addGestureRecognizer:rotation];
}
//3.实现手势方法
-(void)rotationGes:(UIRotationGestureRecognizer *)rotationGes{
//旋转
self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotationGes.rotation);
//复位
[rotationGes setRotation:0];
}
@end
注意：如果想要同时缩放和旋转，需要询问代理是否允许这样做
#pragma mark - UIGestureRecognizerDelegate
//Simultaneously : 同时地
//是否允许两个手势同时进行
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
//允许两个手势同时进行
return YES;
}