UIActivityIndicatorView

继承自UIView
俗称为“菊花”

UIActivityIndicatorView样式

UIActivityIndicatorViewStyleGray

UIActivityIndicatorViewStyleGray.png

UIActivityIndicatorViewStyleWhite
- 背景是白色不可见
  
  UIActivityIndicatorViewStyleWhite.png

UIActivityIndicatorViewStyleWhiteLarge
- 背景是白色不可见
  
  UIActivityIndicatorViewStyleWhiteLarge.png

UIActivityIndicatorView自定义指示器效果示例

- (void)diyHUD
{
    // 创建遮盖
    UIView *cover = [[UIView alloc] init];
    cover.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
    cover.bounds = CGRectMake(0, 0, 200, 150);
    cover.layer.cornerRadius = 10;
    cover.center = CGPointMake(self.view.frame.size.width * 0.5, self.view.frame.size.height * 0.5);
    [self.view addSubview:cover];

    // 往遮盖中添加菊花
    UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    [loadingView startAnimating];
    loadingView.center = CGPointMake(cover.frame.size.width * 0.5, cover.frame.size.height * 0.5);
    [cover addSubview:loadingView];

    // 往遮盖中添加提醒文字
    UILabel *label = [[UILabel alloc] init];
    label.text = @"正在拼命加载中...";
    label.textAlignment = NSTextAlignmentCenter;
    CGFloat labelH = 70;
    label.textColor = [UIColor whiteColor];
    label.frame = CGRectMake(0, cover.frame.size.height - labelH, cover.frame.size.width, labelH);
    [cover addSubview:label];
}