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:
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目录结构与视图结构:
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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:
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接着将lable和statusText连接在一块:
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最后运行程序,点击botton看看效果:
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