1 前言
平時做App的時候總會遇到，UITextField的鍵盤會遮擋住下面的內容，由於IOS沒有自己的機制，所以需要自己寫方法來控制，今天我們就介紹一種簡單的方法，來應對鍵盤遮擋問題。

2 代碼實例
ZYViewController.h

 

[plain]
#import <UIKit/UIKit.h> 
 
@interface ZYViewController : UIViewController<UITextFieldDelegate> 
 
@property(nonatomic,strong) UITextField *myTextField; 
 
@end 

#import <UIKit/UIKit.h>

@interface ZYViewController : UIViewController<UITextFieldDelegate>

@property(nonatomic,strong) UITextField *myTextField;

@end
ZYViewController.m

 

[plain]
@synthesize myTextField; 
 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    //Do any additional setup after loading the view, typically from a nib. 
    //self.view.backgroundColor = [UIColor underPageBackgroundColor]; 
    myTextField = [[UITextField alloc] init];//初始化UITextField 
    myTextField.frame = CGRectMake(35, 230, 250, 35); 
    myTextField.delegate = self;//設置代理 
    myTextField.borderStyle = UITextBorderStyleRoundedRect; 
    myTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直居中 
    myTextField.placeholder = @"Please entry your content!";//內容為空時默認文字 
    myTextField.returnKeyType = UIReturnKeyDone;//設置放回按鈕的樣式 
    myTextField.keyboardType = UIKeyboardTypeNumbersAndPunctuation;//設置鍵盤樣式為數字 
    [self.view addSubview:myTextField]; 
     
     
    //注冊鍵盤出現與隱藏時候的通知 
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboadWillShow:) 
                                             name:UIKeyboardWillShowNotification 
                                             object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillHide:) 
                                          name:UIKeyboardWillHideNotification 
                                          object:nil]; 
    //添加手勢，點擊屏幕其他區域關閉鍵盤的操作 
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)]; 
    gesture.numberOfTapsRequired = 1;//手勢敲擊的次數 
    [self.view addGestureRecognizer:gesture]; 
} 
 
//鍵盤出現時候調用的事件 
-(void) keyboadWillShow:(NSNotification *)note{ 
    NSDictionary *info = [note userInfo]; 
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;//鍵盤的frame 
    CGFloat offY = (460-keyboardSize.height)-myTextField.frame.size.height;//屏幕總高度-鍵盤高度-UITextField高度 
    [UIView beginAnimations:nil context:NULL];//此處添加動畫，使之變化平滑一點 
    [UIView setAnimationDuration:0.3];//設置動畫時間 秒為單位 
    myTextField.frame = CGRectMake(35, offY, 250, 35);//UITextField位置的y坐標移動到offY 
    [UIView commitAnimations];//開始動畫效果 
     
} 
//鍵盤消失時候調用的事件 
-(void)keyboardWillHide:(NSNotification *)note{ 
    [UIView beginAnimations:nil context:NULL];//此處添加動畫，使之變化平滑一點 
    [UIView setAnimationDuration:0.3]; 
    myTextField.frame = CGRectMake(35, 230, 250, 35);//UITextField位置復原 
 
    [UIView commitAnimations]; 
} 
//隱藏鍵盤方法 
-(void)hideKeyboard{ 
    [myTextField resignFirstResponder]; 
} 
#pragma mark - 
#pragma mark UITextFieldDelegate 
//開始編輯： 
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField 
{ 
    return YES; 
} 
 
//點擊return按鈕所做的動作： 
- (BOOL)textFieldShouldReturn:(UITextField *)textField 
{ 
    [textField resignFirstResponder];//取消第一響應 
    return YES; 
} 
 
//編輯完成： 
- (void)textFieldDidEndEditing:(UITextField *)textField 
{ 
     
} 
 
-(void)viewDidDisappear:(BOOL)animated{ 
    [super viewDidDisappear:animated]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self];//移除觀察者 
} 

@synthesize myTextField;

- (void)viewDidLoad
{
    [super viewDidLoad];
 //Do any additional setup after loading the view, typically from a nib.
    //self.view.backgroundColor = [UIColor underPageBackgroundColor];
    myTextField = [[UITextField alloc] init];//初始化UITextField
    myTextField.frame = CGRectMake(35, 230, 250, 35);
    myTextField.delegate = self;//設置代理
    myTextField.borderStyle = UITextBorderStyleRoundedRect;
    myTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直居中
    myTextField.placeholder = @"Please entry your content!";//內容為空時默認文字
    myTextField.returnKeyType = UIReturnKeyDone;//設置放回按鈕的樣式
    myTextField.keyboardType = UIKeyboardTypeNumbersAndPunctuation;//設置鍵盤樣式為數字
    [self.view addSubview:myTextField];
   
   
    //注冊鍵盤出現與隱藏時候的通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboadWillShow:)
                                             name:UIKeyboardWillShowNotification
                                             object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                          name:UIKeyboardWillHideNotification
                                          object:nil];
    //添加手勢，點擊屏幕其他區域關閉鍵盤的操作
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)];
    gesture.numberOfTapsRequired = 1;//手勢敲擊的次數
    [self.view addGestureRecognizer:gesture];
}

//鍵盤出現時候調用的事件
-(void) keyboadWillShow:(NSNotification *)note{
    NSDictionary *info = [note userInfo];
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;//鍵盤的frame
    CGFloat offY = (460-keyboardSize.height)-myTextField.frame.size.height;//屏幕總高度-鍵盤高度-UITextField高度
    [UIView beginAnimations:nil context:NULL];//此處添加動畫，使之變化平滑一點
    [UIView setAnimationDuration:0.3];//設置動畫時間 秒為單位
    myTextField.frame = CGRectMake(35, offY, 250, 35);//UITextField位置的y坐標移動到offY
    [UIView commitAnimations];//開始動畫效果
   
}
//鍵盤消失時候調用的事件
-(void)keyboardWillHide:(NSNotification *)note{
    [UIView beginAnimations:nil context:NULL];//此處添加動畫，使之變化平滑一點
    [UIView setAnimationDuration:0.3];
    myTextField.frame = CGRectMake(35, 230, 250, 35);//UITextField位置復原

    [UIView commitAnimations];
}
//隱藏鍵盤方法
-(void)hideKeyboard{
    [myTextField resignFirstResponder];
}
#pragma mark -
#pragma mark UITextFieldDelegate
//開始編輯：
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    return YES;
}

//點擊return按鈕所做的動作：
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];//取消第一響應
    return YES;
}

//編輯完成：
- (void)textFieldDidEndEditing:(UITextField *)textField
{
   
}

-(void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];//移除觀察者
}
運行結果：

初始狀態

 

單擊輸入框後