2011-05-20 41 views
4

嘿人, 我尝试向UIButtonTypeRoundedRect添加一个很好的渐变。iphone:将CALayer作为子图层添加到UIButton的图层原因EXC_BAD_ACCESS

viewWillAppear:(BOOL)animated 

我的视图控制器的功能。

UIButton *tempButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
tempButton.frame = CGRectMake(left, top, 80.0f, 80.0f); 

CAGradientLayer * hintergrundButtonLayer = [[CAGradientLayer alloc] init]; 
[hintergrundButtonLayer setBounds:tempButton.bounds]; 
[hintergrundButtonLayer setColors:[NSArray arrayWithObjects: 
        [UIColor colorWithRed:0.2 green:0.3 blue:0.4 alpha:1.0], 
        [UIColor colorWithRed:0.4 green:0.5 blue:0.6 alpha:1.0], 
        nil]]; 

[hintergrundButtonLayer setPosition: 
      CGPointMake([tempButton bounds].size.width/2, 
         [tempButton bounds].size.height/2)]; 

[hintergrundButtonLayer setLocations: 
         [NSArray arrayWithObjects: 
           [NSNumber numberWithFloat:0.0], 
           [NSNumber numberWithFloat:1.0], 
           nil]]; 

//  hintergrundButtonLayer.zPosition = -10; 
//  hintergrundButtonLayer.frame = [tempButton bounds]; 


[tempButton addTarget:self action:@selector(switchVendorOnOff:) forControlEvents:UIControlEventTouchUpInside]; 


CALayer * downButtonLayer = [tempButton layer]; 
[downButtonLayer setMasksToBounds:YES]; 
[downButtonLayer setCornerRadius:10.0]; 
[downButtonLayer setBorderWidth:1.2]; 
[downButtonLayer setBorderColor:[[UIColor blackColor] CGColor]]; 


[downButtonLayer addSublayer:hintergrundButtonLayer]; 

[hintergrundButtonLayer release]; 
hintergrundButtonLayer = nil; 

[self.view addSubview:tempButton]; 

代码运行正常,直到该应用尝试显示视图 - 它与一个EXC_BAD_ACCESS crashs。但如果我注释掉

[downButtonLayer addSublayer:hintergrundButtonLayer]; 

命令,那么一切都很好。

调试器告诉我没有任何泄漏。此外,分配模板并不奇怪。除了消息之外,没有任何其他内容被打印到控制台。 “构建和分析”显示没有错误。

有没有人看到我的问题?

回答

8

setColors需要CGColors,而不是UIColors。

[hintergrundButtonLayer setColors:[NSArray arrayWithObjects: 
    [[UIColor colorWithRed:0.2 green:0.3 blue:0.4 alpha:1.0] CGColor], 
    [[UIColor colorWithRed:0.4 green:0.5 blue:0.6 alpha:1.0] CGColor], 
    nil]]; 

如果你读的崩溃顶部堆栈帧(在调试器下运行时),他们提出一个问题CGColors:

(gdb) bt 
#0 0x00bd407c in CGColorSpaceGetMD5Digest() 
#1 0x00b4f8b2 in CGColorTransformConvertColorFloatComponents() 
#2 0x00b4fea2 in CGColorTransformConvertColorComponents() 
#3 0x00cb0d62 in CA_CGColorGetRGBComponents() 
#4 0x00d509aa in -[CAGradientLayer _copyRenderLayer:layerFlags:commitFlags:]() 
+0

我想你的succestion,但它没有工作!我认为[downButtonLayer addSublayer:hintergrundButtonLayer]的调用;只是将指向hintergrundButtonLayer对象的指针指向downButtonLayer对象。如果我将指针hintergrundButtonLayer设置为nil,那么downButtonLayer对象应该仍然有一个指向hintergrundButtonLayer对象的指针。 – dac 2011-05-20 16:31:19

+0

你是对的无效。 – diciu 2011-05-20 17:07:09

+0

你做到了!非常感谢你的帮助 !!!!正是这个问题,错误的颜色类型;) – dac 2011-05-20 18:13:06