iOS.UIKit.09.UINavigationBar

一、点击UINavigationBar中的UIBarButtonItem,改变UILabel中的文本，如图01，02，03

图01图02图03

二、项目步骤：

1、选择Simple View Aplication,取名cq.40.UINavigationBar，如图04

图04

2、Main.storyboard,如图05

3、CQ40ViewController.h

#import <UIKit/UIKit.h>

@interface CQ40ViewController : UIViewController
@property (weak,nonatomic) IBOutlet UILabel *label;
- (IBAction)save:(id)sender;

- (IBAction)add:(id)sender;
@end

4、CQ40ViewController.m

#import "CQ40ViewController.h"

@interface CQ40ViewController ()
@end
@implementation CQ40ViewController
- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

}
- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}
- (IBAction)save:(id)sender

{

    self.label.text = @"click Save";

}

- (IBAction)add:(id)sender

{

    self.label.text = @"click Add";

}
@end

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