iphone之控件、控件事件与OC代码关联

ios中对应的控件（文本控件、按钮控件等）、控件事件（点击、拖动）,两者的类型都非常多。 笔者以文本控控件、按钮事件来介绍它们与OC代码的关联。

我以下图为例，当鼠标点击按钮式，文本框显示“Hello Word.”





按钮点击回调函数注册

通过xib试图，以按钮为始，以File's Owner为终在提示的小窗口选取对应的回调函数
文本框与OC中UITextField关联

首先要定义UITextField为IBoutle类型。

然后以File's Owner为始，以按钮为终，在提示的小窗口选取对应的控件

主要代码：

Hello_WorldViewController.h

//
//  Hello_WorldViewController.h
//  Hello World
//
//  Copyright __MyCompanyName__ 2012. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface Hello_WorldViewController : UIViewController {
UITextField *txtField;
}

@property (nonatomic, retain) IBOutlet UITextField *txtField;

-(IBAction)onClickButton:(id)sender;

@end

Hello_WorldViewController.m

//
//  Hello_WorldViewController.m
//  Hello World
//
//  Copyright __MyCompanyName__ 2012. All rights reserved.
//

#import "Hello_WorldViewController.h"

@implementation Hello_WorldViewController

@synthesize txtField;

-(IBAction)onClickButton:(id)sender {

//txtField.text = @"Hello World.";
NSString *str = [[NSString alloc] initWithFormat:@"Hello. %@", txtField.text];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello!"
message:str delegate:self
cancelButtonTitle:@"Done"
otherButtonTitles:nil];
[alert show];
[alert release];
[str release];

}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.txtField = nil;
}

- (void)dealloc {
[txtField dealloc];
[super dealloc];
}

@end