titleView不居中的问题

突然发现自定义完 leftBarButtonItem 然后自定义titleView，titleView往右偏移

究其原因是因为 设置titleview之前，先初始化leftBarButtonItem和rightBarButtonItem的位置，然后根据leftBarButtonItem和rightBarButtonItem的位置来使titleview居中。

//必须放在 leftBarButtonItem和rightBarButtonItem初始化之后调用

废话不说 上代码

CGRect leftViewbounds = self.navigationItem.leftBarButtonItem.customView.bounds;

CGRect rightViewbounds = self.navigationItem.rightBarButtonItem.customView.bounds;

CGRect frame;

CGFloat maxWidth = leftViewbounds.size.width > rightViewbounds.size.width ? leftViewbounds.size.width : rightViewbounds.size.width;

maxWidth += 15;//leftview 左右都有间隙，左边是5像素，右边是8像素，加2个像素的阀值 5 ＋ 8 ＋ 2

frame = self.titleLabel.frame;

frame.size.width = SWIDTH - maxWidth * 2;

self.titleLabel.frame = frame;

self.navigationItem.titleView = self.titleLabel;