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iOS中的各种手势

编程日记 2024-06-23 19:20:00

/**
基类UIGestureRecognizer
UITapGestureRecognizer Tap 点击
UIPanGestureRecognizer Pan (慢速滑动，拖移)
UILongPressGestureRecognizer LongPress (长按)
UIPinchGestureRecognizer Pinch （捏合，两手指往内或外拨动）
UIRotationGestureRecognizer Rotation (旋转)
UISwipeGestureRecognizer Swipe (快速滑动，轻扫)
*/

#import "ViewController.h"

#define kRandomValue (arc4random() %256 /256.0)
@interface ViewController () <UIGestureRecognizerDelegate>

@property (nonatomic,strong) UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//强烈不建议往一个控件上加很多手势
[self addImageView];
[self addTapGesture];//点击手势
//[self addPanGesture];//拖移手势
[self addLongPressGesture];//长按手势
[self addPinchGesture];//捏合
[self addResetButton];//重置
[self addRotationGesture];//旋转
[self addSwipeGesture];//轻扫
}

-(void)addImageView{
UIImage *image=[UIImage imageNamed:@"cloth"];
self.imageView=[[UIImageView alloc] initWithImage:image];//这样写默认imageView的大小和image的大小一样
self.imageView.userInteractionEnabled=YES;//打开用户交互
self.imageView.center=self.view.center;
[self.view addSubview:self.imageView];
}

-(void)addTapGesture{
UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] init];
//tap.numberOfTapsRequired=2;//默认为1，点击次数
//tap.numberOfTouchesRequired=2;//默认为1，多少根手指触摸
[tap addTarget:self action:@selector(tap:)];
[self.imageView addGestureRecognizer:tap];
}
-(void)tap:(UITapGestureRecognizer *)tap{
UIView *view=tap.view;
view.superview.backgroundColor=[UIColor colorWithRed:kRandomValue green:kRandomValue blue:kRandomValue alpha:1.0];
}

-(void)addPanGesture{
UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc] init];
pan.delegate=self;
[pan addTarget:self action:@selector(pan:)];
[self.imageView addGestureRecognizer:pan];
}
-(void)pan:(UIPanGestureRecognizer *)pan{
CGPoint offset=[pan
translationInView:self.view];
CGPoint center=self.imageView.center;
center.x+=offset.x;
center.y+=offset.y;
self.imageView.center=center;

//不让其累加
[pan setTranslation:CGPointZero inView:self.view];
}

-(void)addLongPressGesture{
UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc ] init];
[longPress addTarget:self action:@selector(longPress:)];
[self.imageView addGestureRecognizer:longPress];
}
-(void)longPress:(UILongPressGestureRecognizer *)longPress{
switch (longPress.state) {
case UIGestureRecognizerStateBegan:
NSLog(@"你长按了");
break;
case UIGestureRecognizerStateEnded:
NSLog(@"长按结束");
break;
default:
break;
}
}

-(void)addPinchGesture{
UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[self.imageView addGestureRecognizer:pinch];
}
-(void)pinch:(UIPinchGestureRecognizer *)pinch{
NSLog(@"%lf",pinch.scale);
//捏合 scale缩放比例
//transform 变换，仿射变换/矩阵变换，
self.imageView.transform=CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
//重置捏合手势比例，每次都应该相对于当前的
pinch.scale=1;//下次相对比例应该从1开始
}

-(void)addResetButton{
UIButton *button=[UIButton buttonWithType:UIButtonTypeSystem];
button.frame=CGRectMake(0, CGRectGetMaxY(self.imageView.frame)+60, 200, 40);
[button setTitle:@"Reset" forState:UIControlStateNormal];
[button addTarget:self action:@selector(reset:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
-(void)reset:(id)sender{
//恢复imageView的transform
self.imageView.transform=CGAffineTransformIdentity;
}

-(void)addRotationGesture{
UIRotationGestureRecognizer *rotation=[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
[self.imageView addGestureRecognizer:rotation];
}
-(void)rotation:(UIRotationGestureRecognizer *)rotation{
NSLog(@"旋转弧度：%lf",rotation.rotation);
self.imageView.transform=CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
rotation.rotation=0;//重置旋转弧度，相当于当前的从0开始
}

-(void)addSwipeGesture{
UISwipeGestureRecognizer *swipe=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
//swipe默认的direction为right
swipe.direction=UISwipeGestureRecognizerDirectionUp;
[self.imageView addGestureRecognizer:swipe];
}
-(void)swipe:(UISwipeGestureRecognizer *)swipe{
CGPoint center=self.imageView.center;
center.y -=50;
self.imageView.center=center;
}

#pragma mark -UIGestureRecognizerDelegate
//是否支持多个手势
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}

@end

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iOS中的各种手势

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