第一种方式:通过设置 imageView的 layer来裁剪 ImageVIew进行操作
HypnosisterLogoView *logoView = [[HypnosisterLogoView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)]; // 遮掉多余部分 logoView.layer.masksToBounds = YES; // 裁剪圆的半径 logoView.layer.cornerRadius = 50; // 绘制边框 logoView.layer.borderWidth = 1.0; // 设置边框颜色为黑色 logoView.layer.borderColor = [UIColor blackColor].CGColor; // 添加到父视图中 [view addSubview:logoView];
第二种方式:通过代码对画布进行裁剪
UIImage *logo = [UIImage imageNamed:@"logo1.png"]; CGContextRef context = UIGraphicsGetCurrentContext(); CGRect circleRect = CGRectMake(0.0f, 0.0f, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height); // 裁剪成一个圆或椭圆 CGContextAddEllipseInRect(context, circleRect); CGContextClip(context); [logo drawInRect:circleRect]; CGContextAddEllipseInRect(context, circleRect); // 执行绘图,并移除路径 CGContextStrokePath(context);