方法一：設置BarButtonItem的文本樣式為透明顏色，代碼如下：
[[UIBarButtonItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor clearColor]} forState:UIControlStateNormal]; [[UIBarButtonItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor clearColor]} forState:UIControlStateHighlighted]; 此外這種方法會導致title不能居中，被偏移很多，如下所示（雖然不被顯示，也占了導航欄左邊很大一部分位置）
方法二：給UIViewController添加類別，然后在load方法里面用Method Swzilling方法替換 交換ViewDidAppear，部分代碼如下
+(void)load { swizzleMethod([self class], @selector(viewDidAppear:), @selector(ac_viewDidAppear));}- (void)ac_viewDidAppear{ self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:self action:nil]; [self ac_viewDidAppear];}void swizzleMethod(Class class, SEL originalSelector, SEL swizzledSelector){ // the method might not exist in the class, but in its superclass Method originalMethod = class_getInstanceMethod(class, originalSelector); Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector); // class_addMethod will fail if original method already exists BOOL didAddMethod = class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod)); // the method doesn't exist and we just added one if (didAddMethod) { class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod)); } else { method_exchangeImplementations(originalMethod, swizzledMethod); }}注意事項：
要給整個backButtonItem賦值才可以，
注：相關教程知識閱讀請移步到IOS開發頻道。
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