Question

我正在使用以下代码在加载某些数据时显示活动指示器。问题是当我试图再次隐藏它时。活动指标保持不变。屏幕稍微变亮但就是这样。

要表明：

self.overlayView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.overlayView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
    self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    self.activityIndicator.center = self.overlayView.center;
    [self.overlayView addSubview:self.activityIndicator];
    [self.activityIndicator startAnimating];
    [self.tableView addSubview:self.overlayView];

隐藏它：

[self.activityIndicator stopAnimating];
    [self.overlayView removeFromSuperview];

Answer 1

尝试将overlayView添加到tableView的超级视图中：

[self.view.superview addSubview:self.overlayView];

Answer 2

我用stackoverflow问题的组合想出来了。这是我的代码，以显示UIActivityIndicatorView

-(void)loadView {
    [super loadView];    
    self.overlayView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.overlayView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
    self.activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    self.activityIndicator.center = self.overlayView.center;
    [self.overlayView addSubview:self.activityIndicator];
    [self.tableView addSubview:self.overlayView];
    [self.activityIndicator startAnimating];    
}

以下是隐藏它的代码。看起来像将代码放在loadView事件中就完全不同了。

[overlayView removeFromSuperview];

活动指标不会消失

2 个答案: