ios 如何更改 UINavigationController 背景颜色？
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How to change UINavigationController background color?
提问by 4mahmoud
I'm able to change the backgroung image of UINavigationControllerby overriding drawRect: method:
我可以UINavigationController通过覆盖 drawRect: 方法来更改背景图像：
@implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
UIImage *img = [UIImage imageNamed: @"navController.png"];
[img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
self.tintColor = [UIColor blueColor];
}
@end
the background is what I intended to be and the tintColoras well, but when trying to set a color that isn't existing in UIColorclass it fails and shows strange color:
背景是我想要的tintColor，也是，但是当尝试设置UIColor课堂中不存在的颜色时，它会失败并显示奇怪的颜色：
@implementation UINavigationBar (UINavigationBarCategory)
- (void)drawRect:(CGRect)rect {
UIImage *img = [UIImage imageNamed: @"navController.png"];
[img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
self.tintColor = [UIColor colorWithRed:(26/255) green:(103/255) blue:(159/255) alpha:1];
}
@end
How can I force UINavigationBarto show the color I want?
如何强制UINavigationBar显示我想要的颜色？
Note:I'm only having a problem with navigation controller buttons color since the background itself is set to image.
注意：由于背景本身设置为图像，因此我只遇到导航控制器按钮颜色的问题。
回答by mattjgalloway
You need to do this:
你需要这样做：
self.tintColor = [UIColor colorWithRed:(26.0f/255.0f) green:(103.0f/255.0f) blue:(159.0f/255.0f) alpha:1.0f];
Otherwise you're doing integer arithmetic and you'll end up with 0 for all of them probably. Use floating point arithmetic and you get the values you desire.
否则，您正在执行整数算术，最终可能会得到 0。使用浮点运算，你会得到你想要的值。
回答by Jasmeet
This Works for me
这对我有用
self.navigationController.navigationBar.backgroundColor= [UIColor colorWithRed:57.0/255.0 green:158.0/255 blue:209.0/255 alpha:1.0];
