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项目介绍：
一个自定义视图弹出动画（目前支持三种弹出动画，项目中用得比较多），只需要导入分类头文件调用弹出的方法即可完成弹出动画：
CustomAlertView *alert = [[CustomAlertView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
[alert showInWindowWithMode:CustomAnimationModeAlert bgAlpha:0.2 needEffectView:YES];
可以控制背景的透明度，和是否有隐藏视图的效果（默认是有的）
CustomAlertView *alert = [[CustomAlertView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
[alert showInWindowWithMode:CustomAnimationModeDrop bgAlpha:0.2 needEffectView:NO];
UIView *vi = [[UIApplication sharedApplication].keyWindow viewWithTag:TagValue];
vi.userInteractionEnabled = NO;
Demo地址：https://github.com/aasdsjk/CustomAlertView
