文本框防QQ登录界面 代理 协议 回车换控件

 

 

使用协议时，需加文本框委托
 

//
//  HelloWorldViewController.h
//  QQ登录框
//
//  Created by mahongmin on 14-5-18.
//  Copyright (c) 2014年 mahongmin. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface HelloWorldViewController : UIViewController <UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *txtQQNum;

@property (weak, nonatomic) IBOutlet UITextField *txtPwd;

@property (weak, nonatomic) IBOutlet UILabel *lblMessage;

- (IBAction)login:(id)sender;

@end


//
//  HelloWorldViewController.m
//  QQ登录框
//
//  Created by mahongmin on 14-5-18.
//  Copyright (c) 2014年 mahongmin. All rights reserved.
//

#import "HelloWorldViewController.h"

@interface HelloWorldViewController ()

@end

@implementation HelloWorldViewController

- (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.
}

//<UITextFieldDelegate>  协议：回车跳到下个控件
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if (self.txtQQNum == textField) {
        [self.txtPwd becomeFirstResponder];
    } else if (self.txtPwd == textField) {
        [self login:nil];
    }
    return TRUE;
}

- (IBAction)login:(id)sender {
    NSString *qq = self.txtQQNum.text;
    NSString *pwd = self.txtPwd.text;
    
    NSString *msg = [NSString stringWithFormat:@"用户名%@,密码为%@", qq, pwd];
    
    self.lblMessage.text = msg;
}
@end