MBProgressHUD 扩展加载动画

效果图：   设计给了一个组的图片，但是由于是透明的背景，会产生卡顿，其实只要两张图片就可以了


创建一个 MBProgressHUD 分类 增加方法

+ (MB_INSTANCETYPE)myShowHUDAddedTo:(UIView *)view animated:(BOOL)animated {
    if (view == nil) view = [[UIApplication sharedApplication].windows lastObject];
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:view animated:animated];
    hud.margin = ;
    hud.color = [UIColor clearColor];

    UIView *customV = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
    UIImageView *backImage = [[UIImageView alloc] initWithFrame:customV.bounds];
    backImage.image = [UIImage imageNamed:@"R-shadow"];
    [customV addSubview:backImage];

    UIImageView * imgView = [[UIImageView alloc] initWithFrame:CGRectMake(, , , )];
    [customV addSubview:imgView];
    CGPoint pppp = imgView.center;
    pppp.y -= ;
    imgView.image = [UIImage imageNamed:@"R-ball"];
    [UIView beginAnimations:@"movement" context:nil];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
    [UIView setAnimationDuration:0.5f];
    [UIView setAnimationRepeatCount:];
    [UIView setAnimationRepeatAutoreverses:YES];
    imgView.center = pppp;
    [UIView commitAnimations];

    hud.customView = customV;
    hud.removeFromSuperViewOnHide = YES;   // 隐藏时候从父控件中移除
    hud.mode = MBProgressHUDModeCustomView;

    return hud;
}