iOS7之前的UI為：

    而在iOS7中，由於設計方面的原因，使得UI變為:         修改的方法重寫UINavigationItem的setLeftBarButtonItem和setRightBarButtonItem方法，使之與之前版本兼容；   代碼如下：   @interface UINavigationItem (margin)   @end   @implementation UINavigationItem (margin) #if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1 - (void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem {     UIBarButtonItem *spaceButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];     spaceButtonItem.width = -12;          if (_leftBarButtonItem)     {         [self setLeftBarButtonItems:@[spaceButtonItem, _leftBarButtonItem]];     }     else     {         [self setLeftBarButtonItems:@[spaceButtonItem]];     }     [spaceButtonItem release]; }   - (void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem {     UIBarButtonItem *spaceButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];     spaceButtonItem.width = -12;          if (_rightBarButtonItem)     {         [self setRightBarButtonItems:@[spaceButtonItem, _rightBarButtonItem]];     }     else     {         [self setRightBarButtonItems:@[spaceButtonItem]];     }     [spaceButtonItem release]; } #endif   @end       項目源碼不做任何修改，問題解決；   添加Button：   UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:btnBack]; self.navigationItem.leftBarButtonItem = leftBarItem; [leftBarItem release];