iOS Swift 使用contentOffset让你的用户注册页面动起来

//  
//  ViewController.h  
//  使用contentOffset让你的用户注册页面动起来  
//  
//  Created by 黄权浩 on 15-1-4.  
//  Copyright (c) 2015年 黄权浩. All rights reserved.  
//  
  
#import <UIKit/UIKit.h>  
  
@interface ViewController : UIViewController<UITextFieldDelegate>  
@property (weak, nonatomic) IBOutlet UIScrollView *scr;  
@property (weak, nonatomic) IBOutlet UITextField *fd1;  
@property (weak, nonatomic) IBOutlet UITextField *fd2;  
@property (weak, nonatomic) IBOutlet UITextField *fd3;  
@property (weak, nonatomic) IBOutlet UITextField *fd4;  
@property (weak, nonatomic) IBOutlet UITextField *fd5;  
@end  



.m






//  
//  ViewController.m  
//  使用contentOffset让你的用户注册页面动起来  
//  
//  Created by 黄权浩 on 15-1-4.  
//  Copyright (c) 2015年 黄权浩. All rights reserved.  
//  
  
#import "ViewController.h"  
  
@interface ViewController ()  
  
@end  
  
@implementation ViewController  
  
- (void)viewDidLoad {  
    [super viewDidLoad];  
    _fd1.delegate = self;  
    _fd2.delegate = self;  
    _fd3.delegate = self;  
    _fd4.delegate = self;  
    _fd5.delegate = self;  
    // Do any additional setup after loading the view, typically from a nib.  
    //按照我们nib上的输入框如果点击的话那么弹出来的键盘会遮盖住输入框，那么我们就可以用setContentOffset这个属性来解决这个问题  
      
}  
  
//在键盘将要输入的时候来判断  
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField  
{  
    if (textField == _fd1) {  
        [_scr setContentOffset:CGPointMake(0, 40) animated:YES];//这样我们让滑动视图向上弹起40的高度，那么键盘就无法遮住输入框了  
    }else if (textField == _fd2) {  
        [_scr setContentOffset:CGPointMake(0, 70) animated:YES];  
    }else if (textField == _fd3) {  
        [_scr setContentOffset:CGPointMake(0, 100) animated:YES];  
    }else if (textField == _fd4) {  
        [_scr setContentOffset:CGPointMake(0, 130) animated:YES];  
    }else if (textField == _fd5) {  
        [_scr setContentOffset:CGPointMake(0, 160) animated:YES];  
    }//这样来我们会做出一个视图滚动的效果，对用户体验是比较好的  
    return YES;  
    //记得在键盘收回的时候给_scr还原  
//    [_scr setContentOffset:CGPointMake(0, 0) animated:YES];  
}  
  
- (void)didReceiveMemoryWarning {  
    [super didReceiveMemoryWarning];  
    // Dispose of any resources that can be recreated.  
}  
  
@end  



在swift中





//  
//  ViewController.swift  
//  使用contentOffset让你的用户注册页面动起来  
//  
//  Created by 黄权浩 on 15-1-4.  
//  Copyright (c) 2015年 黄权浩. All rights reserved.  
//  
  
import UIKit  
  
class ViewController: UIViewController,UITextFieldDelegate {  
  
    @IBOutlet weak var scr: UIScrollView!  
    @IBOutlet weak var fd1: UITextField!  
    @IBOutlet weak var fd2: UITextField!  
    @IBOutlet weak var fd3: UITextField!  
    @IBOutlet weak var fd4: UITextField!  
    @IBOutlet weak var fd5: UITextField!  
      
    override func viewDidLoad() {  
        super.viewDidLoad()  
        // Do any additional setup after loading the view, typically from a nib.  
          
        fd1.delegate = self  
        fd2.delegate = self  
        fd3.delegate = self  
        fd4.delegate = self  
        fd5.delegate = self  
        //按照我们nib上的输入框如果点击的话那么弹出来的键盘会遮盖住输入框，那么我们就可以用setContentOffset这个属性来解决这个问题  
          
    }  
  
    //TextFidldDelegate代理  
    func textFieldShouldBeginEditing(textField: UITextField) -> Bool{  
        if textField == fd1 {  
            scr .setContentOffset(CGPointMake(0, 40), animated: true)//这样我们让滑动视图向上弹起40的高度，那么键盘就无法遮住输入框了  
        }else if textField == fd2 {  
            scr .setContentOffset(CGPointMake(0, 70), animated: true)  
        }else if textField == fd3 {  
            scr .setContentOffset(CGPointMake(0, 100), animated: true)  
        }else if textField == fd4 {  
            scr .setContentOffset(CGPointMake(0, 130), animated: true)  
        }else if textField == fd5 {  
            scr .setContentOffset(CGPointMake(0, 160), animated: true)  
        }//这样来我们会做出一个视图滚动的效果，对用户体验是比较好的  
        return true;  
        //记得在键盘收回的时候给_scr还原  
        //    [_scr setContentOffset:CGPointMake(0, 0) animated:YES];  
    }  
      
    override func didReceiveMemoryWarning() {  
        super.didReceiveMemoryWarning()  
        // Dispose of any resources that can be recreated.  
    }  
  
  
}