iOS,视图相关

Posted 2020-08-09

1.移除视图的所以子视图

2.自定义视图(UIView)

3.处理悬浮窗口(类似微信视频)，等比缩放  

移除视图的所以子视图

 [[self.viewsubviews]makeObjectsPerformSelector:@selector(removeFromSuperview)];

或者 

NSArray *viewsToRemove = [self.view subviews];

    for (UIView *v in viewsToRemove) {

        [v removeFromSuperview];

    }

 

自定义视图(UIView)

//FaceView.m文件 
@implementation FaceView 

-(id)initWithFrame:(CGRect)frame{

    self=[super initWithFrame:frame];

    if (self) {

      

    }

    return self;

}

//自己实现drawRect方法重绘 ,也可以不实现该方法，自己定义执行界面处理方法执行
-(void) drawRect:(CGRect)rect{ //省略实现。。。 

     
}@end

 

处理悬浮窗口(类似微信视频)，等比缩放  

将要加载的view放在主window上或者根视图控制器上，利用transform将视图等比缩放

下面将一个视图在AppDelegate中处理

   FloatingView *view=[[FloatingView alloc] initWithFrame:CGRectMake(50, 50, 200, 200)];

    //添加拖动手势，使视图达到悬浮窗的拖动效果

    UIPanGestureRecognizer *panGestures=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGestures:)];

    [view addGestureRecognizer:panGestures];

    //单击视图手势

    UITapGestureRecognizer *tapGestures=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(narrowView:)];

    [view addGestureRecognizer:tapGestures];

 

    [self.window addSubview:view];

 

 

//点击等比缩小视图

-(void)narrowView:(UITapGestureRecognizer *)sender{

    //等比缩放视图

    sender.view.transform=CGAffineTransformScale(sender.view.transform, 0.5, 0.5);

}

 

//处理视频视图拖动事件

-(void)handlePanGestures:(UIPanGestureRecognizer *)sender{

    if(sender.state!=UIGestureRecognizerStateEnded&&sender.state!=UIGestureRecognizerStateFailed) {

            //通过使用 locationInView 这个方法,来获取到手势的坐标

        CGPoint location=[sender locationInView:sender.view.superview];

        sender.view.center=location;

    }

}