轻量型指示层-SCProgressHUD

别问我问为什么不用MBProgressHUD和SVProgressHUD，MBProgressHUD和SVProgressHUD固然好，但不是自己做的，总有种超脱自己控制的感觉，有时候显得不够灵活，考虑到自己项目的情况做了SCProgressHUD。

SCProgressHUD.gif

SCProgressHUD结构

• 显示

+ (void)showMsg:(NSString *)msg inView:(UIView*)theView afterDelay:(NSTimeInterval)delay completed:(ShowCompleted)completedBlock
{
    SCProgressHUD *alert = [[SCProgressHUD alloc] initWithMsg:msg];
    if (!theView){
        [[self getUnhiddenFrontWindowOfApplication] addSubview:alert];
    }
    else{
        [[SCProgressHUD getWindow] addSubview:alert];
    }
    [alert showAlertWithMsg:delay];
    [alert completed:completedBlock];
}

- (void)completed:(ShowCompleted)completedBlock{
    self.completedBlock = completedBlock;
}

显示的动画用的CAKeyframeAnimation

CAKeyframeAnimation* scaleAnimation =[CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
    scaleAnimation.duration = kDefaultDuration;
    scaleAnimation.cumulative = YES;
    scaleAnimation.repeatCount = 1;
    scaleAnimation.removedOnCompletion = NO;
    scaleAnimation.fillMode = kCAFillModeForwards;
    scaleAnimation.values = [NSArray arrayWithObjects:
                             [NSNumber numberWithFloat:self.animationTopScale],
                             [NSNumber numberWithFloat:1.0f],
                             [NSNumber numberWithFloat:1.0f],
                             [NSNumber numberWithFloat:1.0],
                             nil];
    
    scaleAnimation.keyTimes = [NSArray arrayWithObjects:
                               [NSNumber numberWithFloat:0.0f],
                               [NSNumber numberWithFloat:0.085f],
                               [NSNumber numberWithFloat:0.92f],
                               [NSNumber numberWithFloat:1.0f], nil];
    
    scaleAnimation.timingFunctions = [NSArray arrayWithObjects:
                                      [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn],
                                      [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear],
                                      [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], nil];
    
    
    
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.duration = duration;
    group.delegate = self;
    group.animations = [NSArray arrayWithObjects:scaleAnimation, nil];
    [self.layer addAnimation:group forKey:@"group"];

动画消失后调用回调

  self.completedBlock();
  [self removeFromSuperview];

• HUD隐藏

+ (BOOL)hideHUDForView:(UIView *)view
{
    SCProgressHUD *hud = [self HUDForView:view];
    if (hud != nil) {
        UIWindow *window;
        if (!view){
            window = [self getUnhiddenFrontWindowOfApplication];
        }
        else{
            window = [SCProgressHUD getWindow];
        }
        UIView *backgroundView = [window viewWithTag:100];
        if (backgroundView) {
            [backgroundView removeFromSuperview];
        }
        [hud hidenHUD];
        return YES;
    }
    return NO;
}

- (void)hidenHUD{
    [self.HUDActivity stopAnimating];
    [self removeFromSuperview];
}

此HUD是配合我们的项目来做的，若要引用到其他项目可在此基础略作修改。

项目地址：GitHub