ios - 点击条形按钮时删除 subview

Question

我试图在点击条形按钮时触发添加两个 subview 。但是添加 subview 工作得很好，但是当我尝试删除 subview 时，它不起作用。

这是我正在实现的代码

-(IBAction)showPopover:(id)sender{

    UIView *popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)]; 

    UIView *popoverViewBackground = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 1000)];
    popoverView.alpha = 0.0;
    popoverView.layer.cornerRadius = 2;
    popoverView.layer.borderWidth = 0.1f;
    popoverView.layer.backgroundColor = [UIColor whiteColor].CGColor;
    popoverView.layer.masksToBounds = YES;

    popoverViewBackground.layer.backgroundColor= [UIColor blackColor].CGColor;
    if (popoverCount == 0) {
        [self.view addSubview:popoverViewBackground];
        [self.view addSubview:popoverView];
        popoverCount = 1;
    }else if (popoverCount ==1){
        [popoverView removeFromSuperview];
        [popoverViewBackground removeFromSuperview];
        popoverCount = 0;
    }
    [popoverViewBackground setAlpha:0.5];
    [popoverView setAlpha:1.0];    
}

Answer 1

问题是您每次单击按钮时都在创建新 View ，所以旧 View 不会删除像这样放置您的代码，然后它会正常工作。我已经测试过了。

在.h文件中

@interface secondViewController : UIViewController
{

    int popoverCount;

    UIView *popoverView ;

    UIView *popoverViewBackground;
}

在 .m 文件中

- (void)viewDidLoad
{
    [super viewDidLoad];


    popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, -100, 320, 100)];

    popoverViewBackground = [[UIView alloc] initWithFrame:CGRectMake(0, -100, 320, 100)];
    popoverView.alpha = 0.0;
    popoverView.layer.cornerRadius = 2;
    popoverView.layer.borderWidth = 0.1f;
    popoverView.layer.backgroundColor = [UIColor whiteColor].CGColor;
    popoverView.layer.masksToBounds = YES;

    popoverViewBackground.layer.backgroundColor= [UIColor blackColor].CGColor;
}

-(IBAction)showPopover:(id)sender {

                if (popoverCount == 0) {
        [self.view addSubview:popoverViewBackground];

        [self.view addSubview:popoverView];

                [UIView animateWithDuration:0.5
                                 animations:^{
                                     popoverView.frame = CGRectMake(0,0,320,100);
                                 }
                                 completion:^(BOOL finished){
                                     ;
                                 }];
                [UIView animateWithDuration:0.5
                                 animations:^{
                                     popoverViewBackground.frame = CGRectMake(0,0,320,100);
                                 }
                                 completion:^(BOOL finished){
                                     ;
                                 }];
        popoverCount = 1;
    }else if (popoverCount ==1){


        [UIView animateWithDuration:0.5
                         animations:^{
                             popoverView.frame = CGRectMake(0,-100,320,100);
                         }
                         completion:^(BOOL finished){
                              [popoverView removeFromSuperview];
                         }];
        [UIView animateWithDuration:0.5
                         animations:^{
                             popoverViewBackground.frame = CGRectMake(0,-100,320,100);
                         }
                         completion:^(BOOL finished){
                             [popoverViewBackground removeFromSuperview];
                         }];


        popoverCount = 0;
    }
    [popoverViewBackground setAlpha:0.5];
    [popoverView setAlpha:1.0];   

}