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嘿人,我尝试为UIButtonTypeRoundedRect添加一个漂亮的渐变.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] …