看://UIImageView*stretchTest=[[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"image.png"]];//[selfaddSubview:stretchTest];UIButton*stretchTest=[UIButtonbuttonWithType:UIButtonTypeCustom];[stretchTestsetFrame:CGRectMake(0,0,400,100)];[stretchTestsetBackgroundImage:[UIImageimageNamed:@"image.p