iOS.UIKit.09.UINavigationBar

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一、點擊UINavigationBar中的UIBarButtonItem,改變UILabel中的文本，01，02，03

圖01圖02圖03

二、項目步驟：

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

圖04

2、Main.storyboard,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