iOS开发基础 - UITouch的使用

UITouch的使用
#pragma mark --touch触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
#pragma mark --UITouch对象属性
//     因为单击时touches里面只有一个UITouch对象，所以可以用anyObject方法取里面存储的对象
UITouch *touch = [touches anyObject];
//    记录点击时的事件，是一个时间戳
NSTimeInterval time = touch.timestamp;
NSLog(@"%f",time);

//    判断点击次数
NSInteger count = touch.tapCount;
NSLog(@"%ld",(long)count);

//   获取到我们点击的当前的view
UIView *view00 = [touch view];
NSLog(@"%@",view00);

//    - (CGPoint)locationInView:(UIView *)view;
//    - (CGPoint)previousLocationInView:(UIView *)view;
//    后面的参数说明坐标是相对于当前参数的坐标
CGPoint prePoint = [touch previousLocationInView:self.view];

NSLog(@"上一次点击时的坐标：%@",NSStringFromCGPoint(prePoint));

CGPoint currentPoint = [touch locationInView:self.view];

NSLog(@"当前点击的坐标：%@",NSStringFromCGPoint(currentPoint));

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"ssss");
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"33333");
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

UITouch *touch = [touches anyObject];

CGPoint prePoint = [touch previousLocationInView:self.view];

NSLog(@"上一次点击时的坐标：%@",NSStringFromCGPoint(prePoint));

CGPoint currentPoint = [touch locationInView:self.view];

NSLog(@"当前点击的坐标：%@",NSStringFromCGPoint(currentPoint));

CGPoint pointDelt = CGPointMake(currentPoint.x-prePoint.x, currentPoint.y-prePoint.y);

CGPoint center = CGPointMake(_myView.center.x+pointDelt.x, _myView.center.y+pointDelt.y);

[_myView setCenter:center];
}

UIGesture手势

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>

@property (nonatomic,strong) UIImageView *imageV;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.imageV = [[UIImageView alloc]initWithFrame:CGRectMake(100, 200, 100, 100)];
self.imageV.image = [UIImage imageNamed:@"yellow"];
self.imageV.userInteractionEnabled = YES;
[self.view addSubview:self.imageV];
//command + option

//    [self createTap];

//    [self createLongPress];

//    [self createPan];

[self createPinch];

[self createRotation];

//    [self createSwipe];
}
//手势 用来描述手指与屏幕具体的接触
- (void)createTap{

//UIGestureRecognizer 这是一个手势类  是一个抽象基类 通常我们不会直接使用这个类 而是使用它的子类

//点击手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapImage:)];

//默认就是1
//点击几次
tap.numberOfTapsRequired = 1;
//需要几个手指
tap.numberOfTouchesRequired = 1;
//手势需要添加到某个视图上
[self.imageV addGestureRecognizer:tap];
}

- (void)tapImage:(UITapGestureRecognizer *)tap{
NSLog(@"点击了");
//当前点击的视图
UIImageView *imagV = (id)tap.view;
}
//长按手势
- (void)createLongPress{
//长安手势
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressImage:)];

//最短长按时间
longPress.minimumPressDuration = 2.0;

[self.imageV addGestureRecognizer:longPress];
}

- (void)longPressImage:(UILongPressGestureRecognizer *)press{
NSLog(@"长按");
}

//滑动手势
- (void)createPan{
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panImage)];

[self.imageV addGestureRecognizer:pan];
}
- (void)panImage{
NSLog(@"滑动");
}
//缩放
- (void)createPinch{

UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchImage:)];
//设置代理
pinch.delegate = self;

[self.imageV addGestureRecognizer:pinch];
}
- (void)pinchImage:(UIPinchGestureRecognizer *)pinch{

//缩放系数pinch.scale
self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pinch.scale, pinch.scale);
//重置缩放系数 否则缩放系数会叠加
pinch.scale = 1.0;
//    CGAffineTransformMakeScale(<#CGFloat sx#>, <#CGFloat sy#>)
}
//旋转
- (void)createRotation{

UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationImage:)];
rotation.delegate = self;
[self.imageV addGestureRecognizer:rotation];
}
- (void)rotationImage:(UIRotationGestureRecognizer *)rotation{
//rotation.rotation旋转的角度
self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotation.rotation);
//重置旋转角度 否则会叠加
rotation.rotation = 0;
}
//轻扫
- (void)createSwipe{

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeImage:)];

//轻扫方向
swipe.direction = UISwipeGestureRecognizerDirectionRight;
/*
UISwipeGestureRecognizerDirectionRight = 1 << 0,
UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
UISwipeGestureRecognizerDirectionUp    = 1 << 2,
UISwipeGestureRecognizerDirectionDown  = 1 <<
*/

[self.imageV addGestureRecognizer:swipe];
}

- (void)swipeImage:(UISwipeGestureRecognizer *)swipe{

self.imageV.center = CGPointMake(self.imageV.center.x + 10, self.imageV.center.y);
}
//是否允许添加多个手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
//如需添加多个手势 判断手势所在的view是不是一个view
if (gestureRecognizer.view == otherGestureRecognizer.view) {
return YES;
}
return NO;
}
@end