iOS設定[self.navigationItem setTitleView:View]

自訂NavigationBar

功能需求在NavigationBar上添加搜尋方塊，並對其位置提出了要求，系統中內建的TitleView不能滿足，因此查閱了資料，重寫了TitleView

TitleView.h檔案,重寫TitleView繼承UIView

#import <UIKit/UIKit.h>@interface TitleView : UIView@end

TitleView.m檔案,重寫其父類的Frame

#import "TitleView.h"@implementation TitleView- (instancetype)initWithFrame:(CGRect)frame {    self = [super initWithFrame:frame];    if (self) {    }    return self;}- (void)setFrame:(CGRect)frame {    [super setFrame:CGRectMake(0, 0, self.superview.frame.size.width, self.superview.bounds.size.height)];}@end

在需要使用的地方引用

    // 這裡之所以要把leftBarButtonItem的title = @“”，設為了防止介面從上一層pushViewController：或是從該介面popViewControllerAnimated：是顯示出系統內建的返回箭頭    UIBarButtonItem * backButtonItem = [[UIBarButtonItem alloc] init];    [backButtonItem setTitle:@""];    self.navigationItem.leftBarButtonItem = backButtonItem;    _titleView = [[TitleView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 44)];    _titleView.backgroundColor = [UIColor blackColor];    self.navigationItem.titleView = _titleView;