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设置title颜色:
[[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : kUIColorFromRGB(0xb2151c)} forState:UIControlStateSelected];
设置按钮图片:
UIImage *commonImage = [UIImage imageNamed:[NSString stringWithFormat:@"tabbar_%d", i]];
UIImage *selectedImage = [[UIImage imageNamed: [NSString stringWithFormat:@"tabbar_s%d", i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:itemTitles[i] image:commonImage selectedImage:selectedImage];
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