从UITabBar调用setUnselectedItemTintColor时崩溃应用程序

Question

我已尝试过两条线，但这一切都导致 [UITabBar setUnselectedItemTintColor：]：无法识别的选择器发送到实例

[self.tabBar setUnselectedItemTintColor:[UIColor blackColor]];
[[UITabBar appearance] setUnselectedItemTintColor:[UIColor blackColor]];

有什么建议吗？

Answer 1

此方法仅适用于iOS 10，因此在以前的版本中会崩溃。您应该在调用之前检查方法可用性。

 if ([[UITabBar appearance] respondsToSelector:@selector(setUnselectedItemTintColor:)]) {
     [[UITabBar appearance] setUnselectedItemTintColor:[UIColor blackColor]];
 }

Answer 2

试试这个

if ([[UITabBar appearance] respondsToSelector:@selector(setUnselectedItemTintColor:)]) 
    {
        [[UITabBar appearance]setUnselectedItemTintColor:AppYellowColor];
    }
    else
    {
        [[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:AppYellowColor, NSForegroundColorAttributeName, nil] forState:UIControlStateNormal];
    }