会显示NSObject显示UIActivityIndi​​catorView吗？

Question

我使用NSobject类，其中我有NSURLConnection，但是如何在连接建立和完成时显示UIActivityIndi​​catorView？我尝试过 在appdelegate.m文件中，我在appdidfnish方法中提到了

    Search = [[UIActivityIndicatorView alloc]  
    initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
     [Search setCenter:CGPointMake(160, 240)]; 
     [window addSubview: Search];

我也有个别方法，如

      -(void)anim
{
   [search startAnimating];
}

但如果我通过NSobject.m页面中的appdelegate对象调用此方法，它将无法工作.. 我该怎么办？任何帮助？请？

Answer 1

我不确定，但是你在哪里设置activityIndi​​catorView的框架？我刚刚尝试了这段代码，它的工作非常完美。

  activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
 [activityIndicator setCenter:CGPointMake(160, 240)];
 [activityIndicator startAnimating];
[window addSubview:activityIndicator];
UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setFrame:CGRectMake(100, 300, 120, 50)];
[button setTitle:@"press me" forState:UIControlStateNormal];
[button addTarget:self action:@selector(onBtnClk) forControlEvents:UIControlEventTouchUpInside];
[window addSubview:button];
[window makeKeyAndVisible];

这是onBtnClk方法

- (void) onBtnClk{
if([activityIndicator isAnimating]){
 [activityIndicator stopAnimating];
}else{
 [activityIndicator startAnimating];
}

     

}