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  • UIActivityIndicatorView的使用

    用法一:只显示不停旋转的进度滚轮指示器。
    //显示进度滚轮指示器
    -(void)showWaiting {

    progressInd=[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:
    UIActivityIndicatorViewStyleWhiteLarge];
    progressInd.center=CGPointMake(self.view.center.x,240);
    [self.navigationController.view addSubview:progressInd];
    [progressInd startAnimating];
    }
    //消除滚动轮指示器
    -(void)hideWaiting
    {
    [progressInd stopAnimating];
    }

    用法二:带有半透明背景的进度轮指示器。

    //显示进度滚轮指示器
    -(void)showWaiting:(UIView *)parent {

    int width = 32, height = 32;
    
    CGRect frame = CGRectMake(100, 200, 110, 70) ;//[parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    int y = frame.size.height;
    
    frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);
    UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc]initWithFrame:frame];
    [progressInd startAnimating];
    progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    

    frame = CGRectMake((x - 70)/2, (y - height) / 2 + height, 80, 20);
    UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];
    waitingLable.text = @"Loading...";
    waitingLable.textColor = [UIColor whiteColor];
    waitingLable.font = [UIFont systemFontOfSize:15];
    waitingLable.backgroundColor = [UIColor clearColor];

    frame =  CGRectMake(100, 200, 110, 70) ;//[parent frame];
    UIView *theView = [[UIView alloc] initWithFrame:frame];
    theView.backgroundColor = [UIColor blackColor];
    theView.alpha = 0.7;
    
    [theView addSubview:progressInd];
    

    [theView addSubview:waitingLable];

    [progressInd release];
    

    [waitingLable release];

    [theView setTag:9999];
    [parent addSubview:theView];
    [theView release];
    

    }

    //消除滚动轮指示器
    -(void)hideWaiting
    {
    [[self.view viewWithTag:9999] removeFromSuperview];
    }

    另一种实现
    UIActivityIndicatorView *activityView = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] autorelease];
    activityView.frame = CGRectMake(139.0f-18.0f, 50.0f, 37.0f, 37.0f);
    [self.loadingView addSubview:activityView];
    [activityView startAnimating];
    activityView.center = self.loadingView.center;

    [activityView stopAnimating];

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  • 原文地址:https://www.cnblogs.com/liuqixu/p/4831699.html
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