一次偶然的機，我發現了，原來當 title 文字想對多時，是會靠左顯示而不是居中顯示，，處理起來也不是特別方便，可能你時間費了也解決不掉。這時候有些小朋友就說了，這太簡單了，我搞一個 label 賦給 titleview ，完了設定 label 文字居中就好了，如果有這樣想的朋友我希望你去試試，是不對滴，我這提供一種做法，供參考，如果能幫你解決問題，麻煩點贊鼓勵，謝謝

- (void)setDisplayCustomTitleText:(NSString*)text

{

    UIView *titleView = [[UIView alloc] initWithFrame:CGRectMake

    titleView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;

    titleView.autoresizesSubviews = YES;

    titleView.backgroundColor = [UIColorclearColor];

    UILabel *titleLabel = [[UILabel

    titleLabel.backgroundColor = [UIColor clearColor];

    titleLabel.textAlignment = NSTextAlignmentCenter;

    titleLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    titleLabel.textColor = [UIColor

    titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;

    titleLabel.autoresizingMask = titleView.autoresizingMask;

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;

    frame = titleLabel.frame;

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

    titleLabel.frame = frame;

    frame = titleView.frame;

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

    titleView.frame = frame;

    titleLabel.text = text;

    [titleView addSubview:titleLabel];

self.navigationItem.titleView = titleView;

}