UI定制 - 改变导航栏样式

改变导航栏样式

1 - 我们对 UIViewController 进行扩展，实现导航栏自定制：以改变左标题、字体颜色、背景为例

2 - 代码示例

// - UIViewController+ChangeNavBar.h

#import <UIKit/UIKit.h>
@interface UIViewController (ChangeNavBar)

-(void)demoMethod;

@end

// - UIViewController+ChangeNavBar.h

#import "UIViewController+ChangeNavBar.h"

@implementation UIViewController (ChangeNavBar)

// 定制导航栏
-(void)demoMethod{
    
    // leftBarButtonItem
    UIBarButtonItem *leftBI = [[UIBarButtonItem alloc] initWithImage:[[UIImage imageNamed:@""] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] style:UIBarButtonItemStyleDone target:self action:@selector(backPage)];
    self.navigationItem.leftBarButtonItem = leftBI;
    
    // 导航栏标题颜色
    NSMutableDictionary *arrt = [NSMutableDictionary dictionaryWithCapacity:0];
    arrt[NSForegroundColorAttributeName] = [UIColor greenColor];
    [self.navigationController.navigationBar setTitleTextAttributes:arrt];
    
    // 背景图
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@""] forBarMetrics:UIBarMetricsDefault];
}

// 返回上级页面
-(void)backPage{
    
    [self.navigationController popViewControllerAnimated:YES];
}


@end