-----------ViewController.m中的內容------------

#import "ViewController.h"

#import "ScreenView.h"

@interface ViewController ()<UITextFieldDelegate>

{

    ScreenView *_screenV;//覆蓋全屏

    UIView *secView;

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    [self textFieldOnView:self.view];//添加子視圖

    [self coverBtnOnView:self.view];//添加按鈕

}

- (void)textFieldOnView:(UIView *)currentV{

    UITextField *tF1 = [[UITextField alloc]init];

    tF1.frame = CGRectMake(30, 100, 100, 40);

    tF1.delegate = self;

#PRagma ------設置tF1.tag = 1;

    tF1.tag = 1;

    tF1.borderStyle = UITextBorderStyleRoundedRect;

    [currentV addSubview: tF1];

    UITextField *tF2 = [[UITextField alloc]init];

    tF2.frame = CGRectMake(30, 500, 100, 40);

    tF2.delegate = self;

    tF2.borderStyle = UITextBorderStyleRoundedRect;

    [currentV addSubview: tF2];

    secView = [[UIView alloc]initWithFrame:CGRectMake(150, 200, 200, 300)];

    secView.backgroundColor = [UIColor yellowColor];

    [currentV addSubview:secView];

    UITextField *textF1 = [[UITextField alloc]init];

    textF1.frame = CGRectMake(30, 100, 100, 40);

    textF1.delegate = self;

    textF1.borderStyle = UITextBorderStyleRoundedRect;

    [secView addSubview: textF1];

    UITextField *textF2 = [[UITextField alloc]init];

    textF2.frame = CGRectMake(30, 250, 100, 40);

    textF2.delegate = self;

    textF2.borderStyle = UITextBorderStyleRoundedRect;

    [secView addSubview: textF2];

}

- (void)coverBtnOnView:(UIView *)currentV{

    UIButton *coverBtn = [UIButton buttonWithType:UIButtonTypeSystem];

    coverBtn.backgroundColor = [UIColor cyanColor];

    if (!_screenV) {

        [coverBtn setTitle:@"覆蓋全屏" forState:UIControlStateNormal];

        [coverBtn addTarget:self action:@selector(coverScreen) forControlEvents:UIControlEventTouchUpInside];

    }else{

        [coverBtn setTitle:@"返回" forState:UIControlStateNormal];

        [coverBtn addTarget:self action:@selector(removeCoverScreen) forControlEvents:UIControlEventTouchUpInside];

    }

    UIView *v = [self.view viewWithTag:1];

    coverBtn.frame = v.frame;

    CGRect temp = coverBtn.frame;

    temp.origin.x += temp.size.width;

    coverBtn.frame = temp;

    [currentV addSubview:coverBtn];

}

- (void)removeCoverScreen{

    [_screenV removeFromSuperview];

}

- (void)coverScreen{

    _screenV = [[ScreenView alloc]initWithFrame:[UIScreen mainScreen].bounds];

#pragma -----視圖本身透明度

    _screenV.backgroundColor = [[UIColor brownColor]colorWithAlphaComponent:0.5];

#pragma -----視圖及其子視圖透明度

    //    screenV.alpha = 0.7;

#pragma -----創建view覆蓋全屏，需要新建如ScreenView類，重寫touchesBegan方法

    [[UIapplication sharedApplication].keyWindow addSubview:_screenV];

#pragma -----如果self.view是全屏大小，下句可行，_screenV直接用UIView初始化，并能響應觸摸事件

//    [self.view addSubview:_screenV];

    [self textFieldOnView:_screenV];//添加textField

    [self coverBtnOnView:_screenV];

}

//開始編輯輸入框的時候，軟鍵盤出現，執行此事件

-(void)textFieldDidBeginEditing:(UITextField *)textField

{

    UIView *tempView = self.view;

    if (_screenV) {

        tempView = _screenV;

    }

    UIWindow *window = [[[UIApplication sharedApplication] delegate]window];

    CGRect rect = [textField convertRect:textField.bounds toView:window];//將textField相對于其父視圖的坐標轉換成相對于window的坐標

    NSInteger y = rect.origin.y + textField.frame.size.height;

    NSInteger offset = (y - (tempView.frame.size.height - 256.0));//鍵盤高度216 //如何獲取鍵盤高度？

    NSTimeInterval animationDuration = 0.30f;

    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];

    [UIView setAnimationDuration:animationDuration];

    //將視圖的Y坐標向上移動offset個單位，以使下面騰出地方用于軟鍵盤的顯示

    if(offset > 0)

        tempView.frame = CGRectMake(0.0f, -offset, tempView.frame.size.width, tempView.frame.size.height);

    [UIView commitAnimations];

}

////當用戶按下return鍵或者按回車鍵，keyboard消失

//-(BOOL)textFieldShouldReturn:(UITextField *)textField

//{

//    [textField resignFirstResponder];

//    return YES;

//}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    [super touchesBegan:touches withEvent:event];

    [self.view endEditing:YES];

}

//輸入框編輯完成以后，將視圖恢復到原始狀態

-(void)textFieldDidEndEditing:(UITextField *)textField

{

    UIView *tempView = self.view;

    if (_screenV) {

        tempView = _screenV;

    }

    tempView.frame =CGRectMake(0, 0, tempView.frame.size.width, tempView.frame.size.height);

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

-----------------ScreenView.m中的內容-----------------

#import "ScreenView.h"

@implementation ScreenView

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    [super touchesBegan:touches withEvent:event];

    [self endEditing:YES];

}

@end

有疏漏之處敬請指正。

END