iphone:将CALayer作为子层添加到UIButton';s层导致EXC\u访问错误

iphone:将CALayer作为子层添加到UIButton';s层导致EXC\u访问错误,iphone,uibutton,calayer,exc-bad-access,gradient,Iphone,Uibutton,Calayer,Exc Bad Access,Gradient,大家好, 我试着给UIButtonTypeUndedrect添加一个很好的渐变。以下代码在中实现 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 * hinte

大家好, 我试着给UIButtonTypeUndedrect添加一个很好的渐变。以下代码在中实现

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];
在应用程序尝试显示视图之前,代码运行正常-它会在执行错误访问时崩溃。但是如果我把这个评论删掉

[downButtonLayer addSublayer:hintergrundButtonLayer];   
命令,那么一切都好了

调试器没有告诉我任何关于泄漏的信息。分配模板也没有显示任何奇怪的内容。控制台上除了显示EXC\u BAD\u ACCESS消息外,没有其他内容。“构建和分析”没有显示错误

有人看到我的问题了吗?

设置颜色采用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]];
如果读取崩溃中的顶层堆栈帧(在调试器下运行时),它们表明CGColors存在问题:

(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:] ()

我试过你的成功,但没有成功!我认为[downButtonLayer addSublayer:hintergrundButtonLayer]的调用;只需将hintergrundButtonLayer对象的指针指定给downButtonLayer对象。。如果我将我的指针HinterRundButtonLayer设置为nil,downButtonLayer对象应该仍然有一个指向HinterRundButtonLayer-object的指针。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;)