#在蓝懿学习iOS的日子#day20

1、touch触发点点击屏幕

@property (nonatomic, strong)UIImageView *iv;

- (void)viewDidLoad {
    [super viewDidLoad];
    self.iv = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    self.iv .backgroundColor =  [UIColor blackColor];
    [self.view addSubview:self.iv];

}
//开始
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    //    把set转成array
    //    NSArray *arr = touches.allObjects;
    //NSLog(@"开始");
    //*********获取单个手指坐标
    UITouch*t=[touches anyObject];
    CGPoint p = [t locationInView:self.view];
    self.iv.center = p;
    //在控制台输出的NO.1
    NSLog(@"开始 %f--%f",p.x,p.y);
    //NO.2把中心点转为字符串
     NSLog(@"开始 %@",NSStringFromCGPoint(p));
   //用户点击的数量
    NSLog(@"=====%ld",t.tapCount);
     //*********获取两个
    NSArray *arr = touches.allObjects;
    if (arr.count==2) {
        UITouch *t1 = arr[0];
        UITouch *t2 = arr[1];
       
        CGPoint p1 = [t1 locationInView:self.view];
        CGPoint p2 = [t2 locationInView:self.view];
       
        NSLog(@"p1=%@ p2=%@",NSStringFromCGPoint(p1),NSStringFromCGPoint(p2));
        }
}
//移动
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
       // NSLog(@"移动");
    UITouch*t=[touches anyObject];
    CGPoint p = [t locationInView:self.view];
       self.iv.center = p;
     NSLog(@"移动 %@",NSStringFromCGPoint(p));
}
//结束
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
        //NSLog(@"结束");
    UITouch*t=[touches anyObject];
    CGPoint p = [t locationInView:self.view];
       self.iv.center = p;
     NSLog(@"结束 %@",NSStringFromCGPoint(p));
}
//因为意外退出
-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
        NSLog(@"因为意外退出");

}

 2、  当用户使用超过一个的触屏点的坐标要勾选

 

3、超出视图的Bouns不显示