UIAlertView 更新标题

Posted 2023-02-23

【中文标题】UIAlertView 更新标题

【英文标题】：UIAlertView update title

【发布时间】：2014-01-20 14:30:53

【问题描述】：

我有一个 UIAlertView，它被声明为

-(UIAlertView *)waitingDialog 
    if (!_waitingDialog) 
        _waitingDialog = [[[UIAlertView alloc] initWithTitle:@"" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
    
    return _waitingDialog;

show方法声明为：

-(void)showWaitingDialogWithText:(NSString *)text 
    [self.waitingDialog setTitle:text];
    [self.waitingDialog show];
    UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    indicator.center = CGPointMake(self.waitingDialog.bounds.size.width / 2, self.waitingDialog.bounds.size.height - 50);
    [indicator startAnimating];
    [self.waitingDialog addSubview:indicator];
    [indicator release];

问题是：如何更新标题？ 我尝试了以下但它不起作用。标题保持不变：

[self.waitingDialog setTitle:newTitle];
CGRect waitingFrame = self.waitingDialog.frame;
UILabel *alertLabel = [self.waitingDialog.subviews objectAtIndex:1];
CGRect waitingLabelFrame = alertLabel.frame;

[UIView animateWithDuration:0.15 delay:0.4 options:(UIViewAnimationCurveEaseIn) animations:^
   [self.waitingDialog setFrame:waitingFrame];
    alertLabel.frame = waitingLabelFrame;

 completion:nil];

【参考方案1】：

试试这个

self.waitingDialog.title = @"new title";
[self.waitingDialog setNeedsDisplay];