button上的图片显示蓝色

UIButton *headImg = [UIButton buttonWithType:UIButtonTypeCustom];

headImg.frame = CGRectMake((UISCREEN_WIDTH-60)/2, 5, 60, 60);

[headImg setImage:[UIImage imageNamed:@"我的.png"] forState:UIControlStateNormal];

headImg.layer.masksToBounds = YES;

headImg.layer.cornerRadius = 30;

headImg.layer.borderWidth = 1;

headImg.layer.borderColor = [UIColor redColor].CGColor;

headImg.tag = 2;

[headImg addTarget:self action:@selector(gotoView:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:headImg];

问题没有解决前的图片：