iOS 设置tabBar点击后Item的背景颜色.

正常在用tabBarController的时候背景色的设置可以是

[_tabbarViewController.tabBarsetBackgroundImage:[UIImageimageWithColor:UIColorFromRGB(0xf5f5f5)]];

但是当你点击某个Item 想让Item的背景色发生变化.可以参考下面这段代码.

 _tabbarViewController.tabBar.selectionIndicatorImage
= [UIImageimageWithColor:UIColorFromRGB(0xffffff)size:CGSizeMake(SCREEN_WIDTH
/4,PHONE_CUSTOM_TABBAR_HEIGHT)];

上面那两个类方法并不是系统的，是我写到了UIImage的类目里 内部实现如下。

+ (UIImage *)imageWithColor:(UIColor *)color {

    CGRect rect =CGRectMake(0.0f,0.0f,
1.0f,1.0f);

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context =UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [colorCGColor]);

    CGContextFillRect(context, rect);

    UIImage *theImage =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return theImage;

}

+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size {

    if (!color || size.width <=0 || size.height <=0)
return nil;

    CGRect rect =CGRectMake(0.0f,0.0f, size.width, size.height);

    UIGraphicsBeginImageContextWithOptions(rect.size,NO,
0);

    CGContextRef context =UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, color.CGColor);

    CGContextFillRect(context, rect);

    UIImage *image =UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}