嘗試從繪製上下文創建UIimage。 沒有看到任何東西。我錯過了什麼,或者完全在我的腦海裏?CGContext Ref as UIImage
代碼
- (UIImage *)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(context, 100, 100);
CGContextAddLineToPoint(context, 150, 150);
CGContextAddLineToPoint(context, 100, 200);
CGContextAddLineToPoint(context, 50, 150);
CGContextAddLineToPoint(context, 100, 100);
CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
CGContextFillPath(context);
// Do your stuff here
CGImageRef imgRef = CGBitmapContextCreateImage(context);
UIImage* img = [UIImage imageWithCGImage:imgRef];
CGImageRelease(imgRef);
CGContextRelease(context);
return img;
}