Question

我有责任在我看来增加劳动监察员:

UILabel* AddLabel(UIView* view,CGRect labelRect, UIStyle* labelStyle, NSString* labelText)
{
    UILabel* label = [[[UILabel alloc] initWithFrame:labelRect] autorelease];
    label.textColor = [UIColor colorWithCGColor:[ labelStyle.textColor CGColor]];
    label.backgroundColor = [UIColor colorWithCGColor:[labelStyle.backgroundColor CGColor]];
    label.font =[UIFont fontWithName: labelStyle.fontName] size:labelStyle.fontSize];

    label.frame = labelRect;
    label.text = labelText;
    [view addSubview:label];
    return label;
}

在UIStyle有这一接口的地方:

@interface UIStyle : NSObject {
    NSString * fontName;
    CGFloat fontSize;
    UIColor* textColor;
    UIColor* backgroundColor;
}

so when I add such label to view, I get memory leak. Here is the trace from Instruments:

   0 libSystem.B.dylib calloc
   1 CoreGraphics CGGlyphBitmapCreate
   2 CoreGraphics CGFontCreateGlyphBitmap8
   3 CoreGraphics CGFontCreateGlyphBitmap
   4 CoreGraphics create_missing_bitmaps
   5 CoreGraphics CGGlyphLockLockGlyphBitmaps
   6  0x317c173f
   7  0x317c3e59
   8 CoreGraphics CGContextDelegateDrawGlyphs
   9 CoreGraphics draw_glyphs
  10 CoreGraphics CGContextShowGlyphsWithAdvances
  11 WebCore WebCore::Font::drawGlyphs(WebCore::GraphicsContext*, WebCore::SimpleFontData const*, WebCore::GlyphBuffer const&, int, int, WebCore::FloatPoint const&, bool) const
  12 WebCore WebCore::Font::drawGlyphBuffer(WebCore::GraphicsContext*, WebCore::GlyphBuffer const&, WebCore::TextRun const&, WebCore::FloatPoint&) const
  13 WebCore WebCore::Font::drawSimpleText(WebCore::GraphicsContext*, WebCore::TextRun const&, WebCore::FloatPoint const&, int, int) const
  14 WebCore WebCore::Font::drawText(WebCore::GraphicsContext*, WebCore::TextRun const&, WebCore::FloatPoint const&, int, int) const
  15 WebCore drawAtPoint(unsigned short const*, int, WebCore::FloatPoint const&, WebCore::Font const&, WebCore::GraphicsContext*, WebCore::BidiStatus*, int)
  16 WebCore -[NSString(WebStringDrawing) __web_drawInRect:withFont:ellipsis:alignment:letterSpacing:lineSpacing:includeEmoji:truncationRect:measureOnly:]
  17 WebCore -[NSString(WebStringDrawing) _web_drawInRect:withFont:ellipsis:alignment:lineSpacing:includeEmoji:truncationRect:measureOnly:]
  18 WebCore -[NSString(WebStringDrawing) _web_drawInRect:withFont:ellipsis:alignment:lineSpacing:includeEmoji:truncationRect:]
  19 UIKit -[NSString(UIStringDrawing) _drawInRect:withFont:lineBreakMode:alignment:lineSpacing:includeEmoji:truncationRect:]
  20 UIKit -[NSString(UIStringDrawing) drawInRect:withFont:lineBreakMode:alignment:lineSpacing:includeEmoji:]
  21 UIKit -[NSString(UIStringDrawing) drawInRect:withFont:lineBreakMode:alignment:lineSpacing:]
  22 UIKit -[UILabel _drawTextInRect:baselineCalculationOnly:]
  23 UIKit -[UILabel drawTextInRect:]
  24 UIKit -[UILabel drawRect:]
  25 UIKit -[UIView(CALayerDelegate) drawLayer:inContext:]
  26 QuartzCore -[CALayer drawInContext:]
  27 QuartzCore backing_callback(CGContext*, void*)
  28 QuartzCore CABackingStoreUpdate
  29 QuartzCore -[CALayer _display]
  30 QuartzCore -[CALayer display]
  31 QuartzCore CALayerDisplayIfNeeded
  32 QuartzCore CA::Context::commit_transaction(CA::Transaction*)
  33 QuartzCore CA::Transaction::commit()
  34 QuartzCore CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*)
  35 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
  36 CoreFoundation __CFRunLoopDoObservers
  37 CoreFoundation __CFRunLoopRun
  38 CoreFoundation CFRunLoopRunSpecific
  39 CoreFoundation CFRunLoopRunInMode
  40 GraphicsServices GSEventRunModal
  41 GraphicsServices GSEventRun
  42 UIKit -[UIApplication _run]
  43 UIKit UIApplicationMain
  44 Cuisine main /iPhone/Projects/iCookProFullSix/iCookPrototype/main.m:14

And I have hundreds of them for several calls of function AddLabel. I call it this way:

AddLabel(self.view, CGRectMake(56, 60, 88, 15), style2, @"text");

The thing is that if I comment label.font =[UIFont fontWithName: labelStyle.fontName] size:labelStyle.fontSize]; - there is no leaks..

为什么如此? 它是“灵魂”还是我做错了吗?

P.S. 这种泄漏只在装置上可见。

谁能提供帮助? 提前感谢!

Answer 1

除非每一条<代码>UIFont你制造的这种泄漏,否则,在你提出申请后,就不必担心由哪一个机构来清理泄漏。

如果每一次创建<条码>,即,或许您的<条码><>条码/代码>类别(与阿片剂的代号相仿)应打上<条码>,而不是重新编号。

另外,你不需要<条码>。

Answer 2

要求保留返回的国库,并人工释放。

我现在尝试了这一尝试,似乎把它留给我。

Answer 3

造成记忆泄露的原因是,UIStyle阶级确实保留并适当释放了真名。应当:

@interface UIStyle : NSObject {
  NSString * fontName;
  CGFloat fontSize;
  UIColor* textColor;
  UIColor* backgroundColor;
}
@property(nonatomic, retain) NSString* fontName;
...

此外,在UIStyle执行档案中,财产应合成,并按交易功能释放。

Answer 4

我的理解是,根据对, is that font Object are cadated Internal, so that future lookup for an same font can take more Immediate. 我确信,记忆中的损失是相当小的,而即将发生的泄漏似乎是实际设计的,因此不会引起任何担忧。

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