8-26 UIControl UIGestureRecognizer 控件

最新推荐文章于 2020-09-22 10:32:51 发布

BigFriendBird

最新推荐文章于 2020-09-22 10:32:51 发布

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分类专栏：千锋ios学习之路文章标签： UIControl UIGestureRecognizer 控件

本文链接：https://blog.youkuaiyun.com/ranqipeng/article/details/48010009

这篇博客详细介绍了iOS中的UIControl类及其用于监听事件的功能，特别提到了如何为UIImageView添加监听。此外，还讲解了UIGestureRecognizer的子类，如UITapGestureRecognizer、UILongPressGestureRecognizer等，以及各种手势的相关属性。同时，文中列举了多个常用控件的属性和用法，如UISegmentedControl、UISlider、UIProgressView、UISwitch和UIActivityIndicatorView等。

UIControl，一个交互类

UIImageView无自带的监听事件，可用UIControl来帮助实现监听

UIImageView的交互属性一定要手动打开，默认是关闭的

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"01"]];
    //交互属性打开
    imageView.userInteractionEnabled = YES;

    [imageView setBounds:CGRectMake(0, 0, 40, 40)];
    [imageView setCenter:CGPointMake(160, 240)];
    [self.view addSubview:imageView];
    
    UIControl *control = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
    [control addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
    //将control添加到imageView上
    [imageView addSubview:control];

UIGestureRecognizer,手势控制抽象类

UITapGestureRecognizer:点击手势

     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];
    //点击的次数
    tap.numberOfTapsRequired = 2;
    //手指数
    tap.numberOfTouchesRequired = 2;
    //视图控件
    //对视图添加点击手势
    [self.view addGestureRecognizer:tap];

UILongPressGestureRecognizer:长按手势

    UILongPressGestureRecognizer *lon = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];
    //最短时间
    lon.minimumPressDuration = 3;
    //响应之前可移动的距离
    lon.allowableMovement = 240;
    [self.view addGestureRecognizer:lon];

UIRotationGestureRecognizer:旋转手势

     UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];
    
    [self.view addGestureRecognizer:rotation];

属性:

rotation 旋转的角度（弧度）

velocity 角速度

UISwipeGestureRecognizer:滑动手势

     UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(gesture:)];
    swipe.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipe];

属性:</