iOS UITextField输入框

参考：https://www.jianshu.com/p/f310fa9459ed   iOS 键盘回车键(换行、回车符)修改

         https://www.jianshu.com/p/532d12375e9a     iOS中收起键盘的几种方式

      

大体来说，收起键盘的方法有：

  • 让textFiled放弃成为第一响应者(resignFirstResponder)
  • 让view或者子view强制结束编辑状态(endEditing)

1.输入完以后用户点击return后收起键盘。

可以点击return收起键盘并不意味着弹出来的键盘一定都有return这个按键，比如数字键盘类型就没有，UIKeyboardTypeWebSearch类型的键盘return键就变成了Go键，需要注意的是这时候的Go键相当于return键。

要想实现点击return让键盘收起，首先需要设置textField代理，当然还有遵循UITextFieldDelegate协议:

_textField.delegate = self;

然后实现协议方法- (BOOL)textFieldShouldReturn:(UITextField *)textField;,当然你也可以在这个方法里 main实现一些需求逻辑，比如判断输入的内容符不符合要求等。

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    return [textField resignFirstResponder];
}

2.点击背景后收起键盘

点击背景收起键盘可以实现view的- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event方法，然后执行view的- (BOOL)endEditing:(BOOL)force;方法。

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self.view endEditing:YES]; //实现该方法是需要注意view需要是继承UIControl而来的
}

还有一些比较笨的方法也可以实现达到点击背景后收起键盘的效果，比如：在背景view上面加手势，添加UIButton或者view，然后在对应的点击事件的监听方法中实现resignFirstResponder或者endEditing。

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(keyboardHide:)];  
//设置成NO表示当前控件响应后会传播到其他控件上，默认为YES。  
tapGestureRecognizer.cancelsTouchesInView = NO;  
//将触摸事件添加到view上
[self.view addGestureRecognizer:tapGestureRecognizer];   

-(void)keyboardHide:(UITapGestureRecognizer*)tap{  
    [textFiled resignFirstResponder];  
}

3.不用view实现endEditing的方法

如果说在比较难获取viewController的view时，可以使用下面的方法：

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

或者

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];


UITextField 和 UITextView

如图修改键盘

UIReturnKeyDefault

 
UIReturnKeyDefault.jpg

UIReturnKeyGo

 
UIReturnKeyGo.jpg

UIReturnKeyGoogle

 
UIReturnKeyGoogle.jpg

UIReturnKeyJoin

 
UIReturnKeyJoin.jpg

UIReturnKeyNext

 
UIReturnKeyNext.jpg

UIReturnKeyRoute

 
UIReturnKeyRoute.jpg

UIReturnKeySearch

 
UIReturnKeySearch.jpg

UIReturnKeySend

 
UIReturnKeySend.jpg

UIReturnKeyYahoo

 
UIReturnKeyYahoo.jpg

UIReturnKeyDone

 
UIReturnKeyDone.jpg

UIReturnKeyEmergencyCall

 
UIReturnKeyEmergencyCall.jpg

UIReturnKeyContinue

 
UIReturnKeyContinue.jpg
UITextView *textView = [[UITextView alloc] init];
textView.returnKeyType = UIReturnKeyDone;

UITextField *textField= [[UITextField alloc] init];
textView.returnKeyType = UIReturnKeyDone;

对回车符事件进行监听

实现 UITextViewDelegate代理里面响

  • -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

实现 UITextFieldDelegate代理里面响

  • -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

这个函数的最后一个参数text代表你每次输入的的那个字，所以：
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"
"]){ //判断输入的字是否是回车，即按下return
        //[textView endEditing:YES];
        //在这里做你响应return键的代码

        return NO; //这里返回NO，就代表return键值失效，即页面上按下return，不会出现换行，如果为yes，则输入页面会换行
    }

    return YES;
}

typedef NS_ENUM(NSInteger, UIReturnKeyType) {
    UIReturnKeyDefault,
    UIReturnKeyGo,
    UIReturnKeyGoogle,
    UIReturnKeyJoin,
    UIReturnKeyNext,
    UIReturnKeyRoute,
    UIReturnKeySearch,
    UIReturnKeySend,
    UIReturnKeyYahoo,
    UIReturnKeyDone,
    UIReturnKeyEmergencyCall,
    UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),
};

//
//  Subtitle_I_loveVC.m
//  meiritupian001
//
//  Created by FAMAR-YF-04 on 2020/6/23.
//  Copyright © 2020 FAMAR-YF-04. All rights reserved.
//

#import "Subtitle_I_loveVC.h"
#import "send_Subtitle.h"

@interface Subtitle_I_loveVC ()<UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *input_Sentence;
@property (nonatomic, strong) send_Subtitle *send_SubtitleVC;
@property (nonatomic, weak)NSString *str_input;//输入的数据
@end

@implementation Subtitle_I_loveVC

-(void)viewWillAppear:(BOOL)animated{

   NSLog(@"视图即将加入窗口时");
    [super viewDidAppear:animated];
       
       if([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
           
           SEL selector = NSSelectorFromString(@"setOrientation:");
           NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
           [invocation setSelector:selector];
           [invocation setTarget:[UIDevice currentDevice]];
           
           NSInteger val = UIInterfaceOrientationPortrait;//横屏
           [invocation setArgument:&val atIndex:2];
           [invocation invoke];
           
       }
  
}



- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.input_Sentence.delegate = self;
    self.input_Sentence.returnKeyType = UIReturnKeyDone;//键盘类型
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    return [textField resignFirstResponder];
}

// 点击空白处收起键盘
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self.view endEditing:YES]; //实现该方法是需要注意view需要是继承UIControl而来的
}

- (IBAction)getinputstr:(id)sender {
    
    UITextField *_field = (UITextField *)sender;
    NSLog(@"fhfhff:%@",[_field text]);
    self.str_input = [_field text];
    
}

- (IBAction)pushSend_Subtitle:(id)sender {
    _send_SubtitleVC = [[send_Subtitle alloc]init];
    if(self.input_Sentence.text.length == 0){
        NSLog(@"输入框输入为空");
        NSLog(@"输入框输入为空:%@",self.input_Sentence.placeholder);
        self.send_SubtitleVC.str_subtitles = self.input_Sentence.placeholder;
    }else{
        NSLog(@"输入框输入不为空");
         NSLog(@"输入框输入不为空:%@",[self.input_Sentence text] );
        self.send_SubtitleVC.str_subtitles = [self.input_Sentence text];
    }
    [self.navigationController pushViewController:self.send_SubtitleVC animated:NO];
//    [self presentViewController:self.send_SubtitleVC animated:YES completion:nil];
}


@end
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原文地址：https://www.cnblogs.com/gaozhang12345/p/13254983.html