如何更改UINavigationController背景颜色？

Question

我可以UINavigationController通过覆盖drawRect:方法来改变背景图像:

@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

背景是我打算成为的tintColor,也是如此,但是当尝试设置UIColor类中不存在的颜色时,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

我怎么强迫UINavigationBar显示我想要的颜色？

注意:我只对导航控制器按钮颜色有问题,因为背景本身设置为图像.

Answer 1

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];

否则你正在进行整数运算,你最终可能会得到0.使用浮点运算,您可以获得所需的值.

Answer 2

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];