怎么导航栏背景居中html,iOS设置导航栏之标题栏居中、标题栏的背景颜色

本章实现效果:

#import "Masonry.h"

&＃64;interface CustomTitleView ()

&＃64;property(nonatomic,strong)UILabel * titleLabel;//标题label

&＃64;property (nonatomic,strong) UIView *contentView;

&＃64;end

&＃64;implementation CustomTitleView

- (instancetype)init

{

self &＃61; [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 &＃61; [UIView new];

}

return _contentView;

}

-(UILabel *)titleLabel

{

if (!_titleLabel) {

_titleLabel &＃61; [[UILabel alloc] init];

_titleLabel.textColor &＃61; [UIColor whiteColor];

_titleLabel.font &＃61; [UIFont boldSystemFontOfSize:17];

_titleLabel.lineBreakMode &＃61; NSLineBreakByTruncatingTail;

_titleLabel.textAlignment &＃61; NSTextAlignmentCenter;

[_titleLabel setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forAxis:UILayoutConstraintAxisHorizontal];

_titleLabel.backgroundColor &＃61; [UIColor redColor];

}

return _titleLabel;

}

- (void)setTitle:(NSString *)title

{

self.titleLabel.text &＃61; 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 &＃61; [[CustomTitleView alloc] init];

titleView.backgroundColor &＃61; [UIColor greenColor];

titleView.frame &＃61; CGRectMake(0, 0, PDScreeenW, 44);

titleView.title &＃61; &＃64;"我是标题";

self.navigationItem.titleView &＃61; titleView;

self.titleView &＃61; titleView;

UIBarButtonItem *rightBarButtonItem &＃61; [[UIBarButtonItem alloc] initWithTitle:&＃64;"" style:UIBarButtonItemStylePlain target:self action:nil];

self.navigationItem.rightBarButtonItem &＃61; rightBarButtonItem;