iOS 修改tabbar图片文字默认的蓝色

UIViewController *vc1 = [[UIViewController alloc] init];
vc1.tabBarItem.title = @"首页";
vc1.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
vc1.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_essence_click_icon"];

给tabBarItem设置好文字和图片后发现选中状态图片和文字都是蓝色的，并不是我们设置好的图片样式。那么如何修改图片文字选中变蓝以及文字大小呢？

修改图片变蓝

1.第一种方法，用代码修改

UIViewController *vc1 = [[UIViewController alloc] init];
vc1.tabBarItem.title = @"首页";
vc1.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
//设置图片的渲染模式为原图original，然后在赋给tabBarItem
UIImage *image = [UIImage imageNamed:@"tabBar_essence_click_icon"];
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
vc1.tabBarItem.selectedImage = image;

2.第二种

DB926635-14C1-4395-8BCB-7A7658902F12.png

修改文字属性

NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
//颜色属性
attributes[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
//字体大小属性
//还有一些其他属性的key可以去NSAttributedString.h文件里去找
attributes[NSFontAttributeName] = [UIFont systemFontOfSize:13];
    
NSMutableDictionary *selectAttri = [NSMutableDictionary dictionary];
selectAttri[NSForegroundColorAttributeName] = [UIColor darkGrayColor];
selectAttri[NSFontAttributeName] = [UIFont systemFontOfSize:13];

UIViewController *vc1 = [[UIViewController alloc] init];
vc1.tabBarItem.title = @"首页";
//设置为选中状态的文字属性
[vc1.tabBarItem setTitleTextAttributes:attributes forState:UIControlStateNormal];
//设置选中状态的属性
[vc1.tabBarItem setTitleTextAttributes:selectAttri forState:UIControlStateSelected];
vc1.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
vc1.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_essence_click_icon"];

补充

进入setTitleTextAttributes这个方法里可以看到这个方法后面有一个宏UI_APPEARANCE_SELECTOR,只要后面有这个宏的方法都可以通过appearance统一设置。
就拿上面这个例子来说吧，我们可以通过appearance统一对文字的属性进行设置，这样就不用对每个vc的tabBarItem设置文字的属性了。

    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
    attributes[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
    attributes[NSFontAttributeName] = [UIFont systemFontOfSize:13];
    
    NSMutableDictionary *selectAttri = [NSMutableDictionary dictionary];
    selectAttri[NSForegroundColorAttributeName] = [UIColor darkGrayColor];
    selectAttri[NSFontAttributeName] = [UIFont systemFontOfSize:13];
    //通过appearance对tabBarItem的文字属性进行统一设置，这样所有的控制的tabBarItem的文字属性久都是这种样式的了
    UITabBarItem *tabbar = [UITabBarItem appearance];
    [tabbar setTitleTextAttributes:attributes forState:UIControlStateNormal];
    [tabbar setTitleTextAttributes:selectAttri forState:UIControlStateSelected];