目前我似乎无法同时设置2种内容模式。但我希望图像既缩放又居中。我该如何实现？@property(weak,nonatomic)IBOutletUIView*windowOut;self.windowOut.layer.borderColor=[UIColorredColor].CGColor;self.windowOut.layer.borderWidth=3.0f;UIImage*face=[UIImageimageNamed:@"face.png"];UIImageView*imageView=[[UIImageViewalloc]initWithFrame:self.window