CTFontRef导致的内存泄漏

Question

我正在生成一个PDF使用下面的细节，在仪器我得到内存泄漏，谁能知道为什么仪器指向CTFontRef到100perc泄漏？

NSMutableAttributedString *string = [[[NSMutableAttributedString alloc]
                                                 initWithString:textToDraw] autorelease];   
CTFontRef helveticaBold = CTFontCreateWithName(CFSTR("Helvetica-Bold"), 8.0, NULL);

[string addAttribute:(id)kCTFontAttributeName
                       value:(id)helveticaBold
                       range:NSMakeRange(0, [string length])];

Answer 1

试试这个(假设是ARC)：

[string addAttribute:(NSString *)kCTFontAttributeName
               value:CFBridgingRelease(helveticaBold)
               range:NSMakeRange(0, [string length])];