iOS-OC 代码风格片段

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_midView= ({    UIView* midView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,self.frame.size.width,_height)];    midView.backgroundColor= [UIColor colorWithRed:0green:0blue:0alpha:0.8];    midView.clipsToBounds=YES;    midView.userInteractionEnabled=YES;    midView;});[selfaddSubview:_midView];