以返回按鈕為例。返回按鈕自定義之后位置有些偏右，因?yàn)閷?dǎo)航欄的NavigationItem是個(gè)比較特殊的View，所以我們無法通過簡單的調(diào)整Frame來的調(diào)整左右按鈕的位置。可以使用蘋果提供的UIButtonBarItem中有個(gè)叫做UIBarButtonSystemItemFixedSpace的控件調(diào)整位置。

UIButton * leftBtn = [UIButton buttonWithType:UIButtonTypeSystem];
leftBtn.frame = CGRectMake(0, 0, 20,20);
[leftBtn setBackgroundImage:[UIImage imageNamed:@"圖片名稱"] forState:UIControlStateNormal];
[leftBtn addTarget:self action:@selector(leftBarBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem * leftBarBtn = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
//創(chuàng)建UIBarButtonSystemItemFixedSpace
UIBarButtonItem * spaceItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
//將寬度設(shè)為負(fù)值spaceItem.width = -10;
//將兩個(gè)BarButtonItem都返回給NavigationItem
self.navigationItem.leftBarButtonItems = @[spaceItem,leftBarBtn];

手勢生效
如果自定義導(dǎo)航欄按鈕會(huì)使滑動(dòng)手勢失效。只要重新添加導(dǎo)航欄的interactivePopGestureRecognizer的delegate手勢即可回歸。

self.navigationController.interactivePopGestureRecognizer.delegate = self;