从UIImage获取CGImage时出错

Question

its work fine when we write: UIImage *img=[UIImage imageNamed:@"ImageName"];

but when try to make uiimage from nsdata like:UIImage *img = [UIImage imageWithData:imageData]; now when we try to get cgimage from img in draw rect then it gives badAccess. if somebody know the exact way to write then please give me solution. i use CGImageRef sourceImageRef = [img CGImage]; in Draw Rect method of UIView.

Answer 1

尝试将UIImage转换为CGImage

CGImage imageRef = imageObject.CGImage

Answer 2

您应该像这样使用alloc init：

UIImage* myImage = [[UIImage alloc] initWithCGImage:myCGImage];