我使用以前的答案中的以下代码通过组合UIImageView和UITextView来创建新的UIImage。从UIImageView和UITextView创建UIImage
UIView *parentView = [[UIView alloc] initWithFrame:CGRectZero];
[parentView addSubview:self.imagePreview];
[self.imagePreview setFrame:CGRectMake(0, 0, 100, 100)];
[parentView addSubview:self.memeTextFieldTop];
[self.memeTextFieldTop setFrame:CGRectMake(20, 20, 80, 20)];
[parentView sizeToFit];
UIGraphicsBeginImageContext([parentView bounds].size);
[[parentView layer] renderInContext:UIGraphicsGetCurrentContext()];
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
这个问题似乎是我目前收到以下错误,我不知道该如何去解决这些问题。
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextSetAlpha: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextGetBaseCTM: invalid context 0x0
<Error>: CGContextConcatCTM: invalid context 0x0
<Error>: CGContextSetBaseCTM: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextSetAlpha: invalid context 0x0
<Error>: CGContextSaveGState: invalid context 0x0
<Error>: CGContextConcatCTM: invalid context 0x0
任何想法如何解决这个问题?
我看你做了[parentView sizeToFit];你确定框架不是CGRectZero吗? – 2013-04-24 11:35:54
多数民众赞成在'因为parentView框架大小仍然为零。用NSLog检查框架。 – x4h1d 2013-04-24 11:46:20