ios - iOS 上 View 的渐变背景

Question

我对 iOS 开发还很陌生，我正在尝试将 View 背景设置为渐变。我创建了一个 CAGradientLayer 并尝试设置它。它经历了构建过程，但我的应用程序一打开就崩溃，抛出“EXC_BAD_ACCESS”。这是我的代码:

- (void)viewWillAppear:(BOOL)animated
 {

 [super viewWillAppear:animated];

CAGradientLayer     *bgLayer = [CAGradientLayer layer];
UIColor             *grey = [UIColor colorWithRed:(255/255.0) green:(255/255.0) blue:(255/255.0) alpha:1.0];
UIColor             *black = [UIColor colorWithRed:(180/255.0) green:(180/255.0) blue:(180/255.0) alpha:1.0];
NSNumber            *top = [NSNumber numberWithFloat:0.0];
NSNumber            *bot = [NSNumber numberWithFloat:1.0];

bgLayer.colors = [NSArray arrayWithObjects:grey, black, nil];
bgLayer.locations = [NSArray arrayWithObjects:top, bot, nil];
bgLayer.frame = self.view.bounds;
[self.view.layer addSublayer:bgLayer];
}

我想我明白它来自于糟糕的内存管理，但不要理解我做错了什么。感谢您提前的答复。

Answer 1

请注意文档中关于颜色的说明:

An array of CGColorRef objects defining the color of each gradient stop.