ios学习笔记(二)xcode 4.3.2下实现基本交互

最后更新于:2022-04-01 09:50:41

想必大家都阅读过iphone4与ipad2开发基础教程吧,这本书的xcode与现在的最新版本有些区别,去掉了view base application,只有比较接近的single view application. 首先我们创建一个single view application,注意这里我们不用自动引用计数。 接着我们点击工程列表中的MainStoryboard_iphone.storyboard 来编辑界面: 我们创建两个按钮和一个用来输出的空白文本: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-09_56dfc827d2f9a.png) 目录结构与视图结构: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-09_56dfc827e3941.png) 2.接着我们写代码来用来与IB界面编辑器来进行连接:在这里我们可以认为IBOutlet是与IB交互的输出,而IBAction则是IB交互的事件。 先编写ViewContoller.h: ~~~ #import <UIKit/UIKit.h> @interface ViewController : UIViewController { } @property (nonatomic,retain) IBOutlet UILabel * statusText; -(IBAction)buttonPressed:(id)sender; @end ~~~ 接着在ViewContoller.m来实现功能: ~~~ #import "ViewController.h" @implementation ViewController @synthesize statusText; -(IBAction)buttonPressed:(id)sender { NSString *title = [sender titleForState:UIControlStateNormal];//sender用于获得了不同的button的文字 titleForState是根据button状态获取文字的函数 NSString *newText = [[NSString alloc] initWithFormat:@"%@ button pressed.", title];//将title中的文字放入newText中 statusText.text = newText; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } - (void)viewDidUnload { [super viewDidUnload]; self.statusText = nil; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } else { return YES; } } - (void)dealloc { [statusText release]; [super dealloc]; } @end ~~~ 接着我们把这些代码与IB连接起来: 选择MainStoryboard_iphone.storyboard 右击View Controller Scene中的 Buton,选择Touch down与界面的 bottonPressed相连接: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-09_56dfc82820845.png) 接着将lable和statusText连接在一块: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-09_56dfc82839c63.png) 最后运行程序,点击botton看看效果: ![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-09_56dfc8284e99a.png)
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