在做iOS 15的適配過程中髓霞，導(dǎo)航欄適配遇到了一個奇怪的問題茅诱，就是原來隱藏的返回按鈕的文字，失效了檩赢。
上代碼

// AppDelegate.m
// 定制返回按鈕
    UIImage *backButtonImage = [[UIImage imageNamed:@"custom_back_icon"] imageWithPadding:UIEdgeInsetsMake(8, 8, -8, 0)];
    
    // 隱藏返回按鈕文字
    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, -200) forBarMetrics:UIBarMetricsDefault];
    [[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

    // 導(dǎo)航欄樣式
    [[UINavigationBar appearance] setTintColor:[UIColor colorFromHex:@"#1B1C33"]];
    [[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];
    [[UINavigationBar appearance] setBackIndicatorImage:backButtonImage];
    [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:backButtonImage];
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    UIColor *color = [UIColor blackColor];
    UIFont *font = [UIFont fontWithName:@"PingFangSC-Medium" size:17.0f];
    [dict setObject:color forKey:NSForegroundColorAttributeName];
    [dict setObject:font forKey:NSFontAttributeName];
    [[UINavigationBar appearance] setTitleTextAttributes:dict];
    
    // iOS 15適配
    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance setBackgroundColor:[UIColor whiteColor]];
        [appearance setShadowImage:[UIImage createImageWithColor:[UIColor whiteColor]]];
        appearance.titleTextAttributes = dict;
        [appearance setBackIndicatorImage:backButtonImage transitionMaskImage:backButtonImage];
        [[UINavigationBar appearance] setScrollEdgeAppearance: appearance];
        [[UINavigationBar appearance] setStandardAppearance:appearance];
    }

我將最后的iOS 15適配的內(nèi)容注釋掉吕嘀，則導(dǎo)航欄返回按鈕的文案可以正常隱藏，加上這段邏輯則不能隱藏。有大佬遇到過這類問題嗎偶房？求助大佬幫忙看看趁曼。

后來參考了overstackflow上的解決辦法，解決了此問題棕洋。根本原因是 UINavigationBarAppearance 的配置會覆蓋原有的配置導(dǎo)致隱藏返回按鈕文案失效挡闰。代碼如下

    // iOS 15適配
    if (@available(iOS 15.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance setBackgroundColor:[UIColor whiteColor]];
        [appearance setShadowImage:[DFCMacros createImageWithColor:[UIColor whiteColor]]];
        appearance.titleTextAttributes = dict;
        [appearance setBackIndicatorImage:backButtonImage transitionMaskImage:backButtonImage];
        // UINavigationBarAppearance 會覆蓋原有的導(dǎo)航欄設(shè)置，這里需要重新設(shè)置返回按鈕隱藏
        appearance.backButtonAppearance.normal.titlePositionAdjustment = UIOffsetMake(NSIntegerMin, -200);

        [[UINavigationBar appearance] setScrollEdgeAppearance: appearance];
        [[UINavigationBar appearance] setStandardAppearance:appearance];
    }

stackoverflow問題地址 https://stackoverflow.com/questions/59882220/uibarbuttonitem-setbackbuttontitlepositionadjustment-doesnt-work