CFAttributedStringRef中的內存泄漏

Question

我使用以下方法在PDF文檔（上下文）上繪製文本。 不知怎的，儀器自帶了以下行泄漏

CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, stringRef, NULL); 

我在哪裏釋放stringRef。下面的代碼（正確答案，這裏的更新/工作代碼後）：

- (void)drawText:(NSString*)textToDraw inFrame:(CGRect)frameRect{ 

CFStringRef stringRef = (__bridge CFStringRef)textToDraw; 
// Prepare the text using a Core Text Framesetter 
CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, stringRef, NULL); 
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText); 

CGMutablePathRef framePath = CGPathCreateMutable(); 
CGPathAddRect(framePath, NULL, frameRect); 

// Get the frame that will do the rendering. 
CFRange currentRange = CFRangeMake(0, 0); 
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL); 
CGPathRelease(framePath); 

// Get the graphics context. 
CGContextRef currentContext = UIGraphicsGetCurrentContext(); 

// Put the text matrix into a known state. This ensures 
// that no old scaling factors are left in place. 
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity); 

// Core Text draws from the bottom-left corner up, so flip 
// the current transform prior to drawing. 
CGContextTranslateCTM(currentContext, 0, frameRect.origin.y*2); 
CGContextScaleCTM(currentContext, 1.0, -1.0); 

// Draw the frame. 
CTFrameDraw(frameRef, currentContext); 

CGContextScaleCTM(currentContext, 1.0, -1.0); 
CGContextTranslateCTM(currentContext, 0, (-1)*frameRect.origin.y*2); 

CFRelease(frameRef); 
//CFRelease(stringRef); The string shouldn't be released 
CFRelease(framesetter); 
//Added the next line: 
CFRelease(currentText); 

}

測試它的設備的模擬器上;它泄漏

Answer 1

您還需要釋放CFAttributedStringRef，並且我沒有看到您已經在方法中釋放它。此功能的所有權遵循創建規則

https://developer.apple.com/library/mac/#documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029