本章实现效果:

Untitled.gif

前言:

项目中很多需求是要求自定义标题栏居中的,本人最近就遇到这中需求,如果用系统自带的titleView设置的话,不会居中,经过尝试，发现titleview的起点位置和尺寸依赖于leftBarButtonItem和rightBarButtonItem的位置。下面给出我的解决方案

首先自定义一个标题View

#import <UIKit/UIKit.h>

@interface CustomTitleView : UIView

@property (nonatomic, copy) NSString *title;

@end

#import "CustomTitleView.h"

#import "Masonry.h"

@interface CustomTitleView ()

@property(nonatomic,strong)UILabel * titleLabel;//标题label

@property (nonatomic,strong) UIView *contentView;

@end

@implementation CustomTitleView

- (instancetype)init

{

    self = [super init];

    if (self) {

        [self addSubview:self.contentView];

        [self.contentView mas_makeConstraints:^(MASConstraintMaker *make) {

            make.left.greaterThanOrEqualTo(self);

            make.right.lessThanOrEqualTo(self);

            make.center.equalTo(self);

            make.bottom.top.equalTo(self);

        }];

        [self.contentView addSubview:self.titleLabel];

        [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {

            make.centerY.equalTo(self.contentView);

            make.centerX.equalTo(self.contentView);

        }];

    }

    return self;

}

- (void)setFrame:(CGRect)frame

{

    [super setFrame:frame];

    [self layoutIfNeeded];

}

- (UIView *)contentView

{

    if (!_contentView) {

        _contentView = [UIView new];

    }

    return _contentView;

}

-(UILabel *)titleLabel

{

    if (!_titleLabel) {

        _titleLabel = [[UILabel alloc] init];

        _titleLabel.textColor = [UIColor whiteColor];

        _titleLabel.font = [UIFont boldSystemFontOfSize:17];

        _titleLabel.lineBreakMode = NSLineBreakByTruncatingTail;

        _titleLabel.textAlignment = NSTextAlignmentCenter;

        [_titleLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];

        _titleLabel.backgroundColor = [UIColor redColor];

    }

    return _titleLabel;

}

- (void)setTitle:(NSString *)title

{

    self.titleLabel.text = title;

}

具体用法如下:

在当前页面的控制中只要写,即可实现上图的效果

  CustomTitleView *titleView = [[CustomTitleView alloc] init];

    titleView.backgroundColor = [UIColor greenColor];

    titleView.frame = CGRectMake(0, 0, PDScreeenW, 44);

    titleView.title = @"我是标题";

    self.navigationItem.titleView = titleView;

    self.titleView = titleView;

    UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:self action:nil];

    self.navigationItem.rightBarButtonItem = rightBarButtonItem;