贝塞尔曲线画圆角

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; 

imageView.center = CGPointMake(200, 300); 

UIImage *anotherImage = [UIImage imageNamed:@"image"]; 

UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 1.0); 

[[UIBezierPath bezierPathWithRoundedRect:imageView.bounds

                           cornerRadius:50] addClip];

[anotherImage drawInRect:imageView.bounds];

imageView.image = UIGraphicsGetImageFromCurrentImageContext(); 

UIGraphicsEndImageContext(); 

[self.view addSubview:imageView];