(Swift&OC)UITextView的的使用技巧

一、关键词

1.1.弹性方向

alwaysBounceVertical垂直
alwaysBounceHorizontal 水平
1.2.滑动UITextView键盘下去
keyboardDismissMode = UIScrollViewKeyboardDismissMode.onDrag
1.3.输入框是否有内容

hasText : 状态是true 和 false
1.4. UITextView上面添加view

inputAccessoryView
1.5. 自定义键盘

inputView
1.6.有关键盘的通知(设置动画节奏),建议多看看下面的代码注释
- UIView动画的本质是核心动画, 所以可以给核心动画设置动画节奏

二、Swift中的使用

2.1.键盘上加一个view(JKTextViewController)

import UIKit

class JKTextViewController: UIViewController {

override func viewDidLoad() {
  super.viewDidLoad()
  
  /**
      1.控制器的基本设置
   */
  title = "JKTextView"
  view.backgroundColor = UIColor.white
  self.edgesForExtendedLayout = []
  
  /**
      2.添加UITextView和提示内容以及键盘上的view
   */
  view.addSubview(textView)
  textView.addSubview(placeholderLabel)
  textView.inputAccessoryView = jkInputAccessoryView
}

// MARK: UITextView 的创建
private lazy var textView:UITextView = {
  
  let textview = UITextView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height-64))
  textview.font = UIFont.systemFont(ofSize: 20)
  // 垂直水平方向有弹性
  textview.alwaysBounceVertical = true
  // 垂直方向滑动键盘下去
  textview.keyboardDismissMode = UIScrollViewKeyboardDismissMode.onDrag
  return textview
}()

// MARK: UILabel 提示文本
private lazy var placeholderLabel: UILabel = {
  
  let label = UILabel(frame: CGRect(x: 5, y: 9, width: UIScreen.main.bounds.width-10, height: 22))
  label.font = UIFont .systemFont(ofSize: 20)
  label.textColor = UIColor.red
  label.text = "分享新鲜事"
  return label
  
}()

 // MARK: UIView 键盘上加个view
 private lazy var jkInputAccessoryView: UIView = {
  
   let inputView = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 44))
   inputView.backgroundColor = UIColor.green
   return inputView
  
 }()
}

// MARK: UITextView代理的实现
 extension JKTextViewController: UITextViewDelegate{

 func textViewDidChange(_ textView: UITextView) {
  
   /**
       hasText 可以判断UITextView是否有内容
    */
   placeholderLabel.isHidden = textView.hasText

   }
 }

2.2.切换自定义键盘(JKTextViewController)

import UIKit

class JKTextViewController: UIViewController {

override func viewDidLoad() {
  super.viewDidLoad()
  
  // 0.注册通知监听键盘弹出和消失
  NotificationCenter.default.addObserver(self, selector: #selector(JKTextViewController.keyboardChange), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
  
  /**
      1.控制器的基本设置
   */
  title = "JKTextView"
  view.backgroundColor = UIColor.white
  self.edgesForExtendedLayout = []
  
  /**
      2.添加UITextView和提示内容以及键盘上的view
   */
  view.addSubview(textView)
  textView.addSubview(placeholderLabel)
  /**
      3.输入框上面自定义一个view
   */
  view.addSubview(toolBar)
  toolBar.addSubview(toolBarBtn)
  
}

 /**
     只要键盘改变就会调用
  */
 @objc func keyboardChange(notify: NSNotification)
 {
  // 1.取出键盘最终的rect
  let value = notify.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
  let rect = value.cgRectValue
  
  // 2.修改工具条的约束
  // 弹出 : Y = 409 height = 258
  // 关闭 : Y = 667 height = 258
  // 667 - 409 = 258
  // 667 - 667 = 0
  
  let duration = notify.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber
  /*
   工具条回弹是因为执行了两次动画, 而系统自带的键盘的动画节奏(曲线) 7
   7在apple API中并没有提供给我们, 但是我们可以使用
   7这种节奏有一个特点: 如果连续执行两次动画, 不管上一次有没有执行完毕, 都会立刻执行下一次
   也就是说上一次可能会被忽略
   
   如果将动画节奏设置为7, 那么动画的时长无论如何都会自动修改为0.5
   
   UIView动画的本质是核心动画, 所以可以给核心动画设置动画节奏
   */
  // 1.取出键盘的动画节奏
  let curve = notify.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! NSNumber
  
  UIView.animate(withDuration: duration.doubleValue) { () -> Void in
      
      // 2.设置动画节奏
      UIView.setAnimationCurve(UIViewAnimationCurve(rawValue: curve.intValue)!)
      self.toolBar.frame.origin.y = rect.origin.y - 64 - 44
  }
  
  let anim = toolBar.layer.animation(forKey: "position")
  print("duration = \(String(describing: anim?.duration))")
}

// MARK: 切换键盘
@objc func switchKeyBoard() {
  
  print("切换表情键盘")
  print(#function)
  // 结论: 如果是系统自带的键盘, 那么inputView = nil
  //      如果不是系统自带的键盘, 那么inputView != nil
  //        print(textView.inputView)
  
  // 1.关闭键盘
  textView.resignFirstResponder()
  
  // 2.设置inputView
  textView.inputView = (textView.inputView == nil) ? keyBoardView : nil
  
  // 3.从新召唤出键盘
  textView.becomeFirstResponder()
}

 deinit
 {
   NotificationCenter.default.removeObserver(self)
 }

 // MARK: UITextView 的创建
 private lazy var textView:UITextView = {
  
  let textview = UITextView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height-64))
  textview.font = UIFont.systemFont(ofSize: 20)
  // 垂直水平方向有弹性
  textview.alwaysBounceVertical = true
  // 垂直方向滑动键盘下去
  textview.keyboardDismissMode = UIScrollViewKeyboardDismissMode.onDrag
  return textview
 }()

 // MARK: UILabel 提示文本
 private lazy var placeholderLabel: UILabel = {
  
  let label = UILabel(frame: CGRect(x: 5, y: 9, width: UIScreen.main.bounds.width-10, height: 22))
  label.font = UIFont .systemFont(ofSize: 20)
  label.textColor = UIColor.red
  label.text = "分享新鲜事"
  return label
  
 }()

 // MARK: UIView 键盘上加个view
 private lazy var toolBar: UIView = {
  
  let inputView = UIView(frame: CGRect(x: 0, y: UIScreen.main.bounds.height-64-44, width: UIScreen.main.bounds.width, height: 44))
  inputView.backgroundColor = UIColor.green
  return inputView
  
 }()

 // MARK: UIView 键盘上加个view 上面加个button
 private lazy var toolBarBtn: UIButton = {
  
  let btn = UIButton(frame: CGRect(x: UIScreen.main.bounds.width-150, y: 0, width: 100, height: 44))
  btn.backgroundColor = UIColor.purple
  btn.titleLabel?.font = UIFont.systemFont(ofSize: 16)
  btn.setTitle("切换键盘", for: UIControlState.normal)
  btn.addTarget(self, action: #selector(JKTextViewController.switchKeyBoard), for: UIControlEvents.touchUpInside)
  return btn
  
 }()

 // MARK: 自定义键盘
 private lazy var keyBoardView: UIView = {
  
  let keyboardView = UIView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 100))
  keyboardView.backgroundColor = UIColor.brown
  return keyboardView
  
  }()
}

// MARK: UITextView代理的实现
extension JKTextViewController: UITextViewDelegate{

  func textViewDidChange(_ textView: UITextView) {
    /**
        hasText 可以判断UITextView是否有内容
     */
     placeholderLabel.isHidden = textView.hasText
  }
}

三、OC中的使用

3.1.键盘上加一个view(TestViewController)

#import "TestViewController.h"
#define CIO_SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define CIO_SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define TitleBlackCOLOR [UIColor colorWithRed:(51)/255.0 green:(51)/255.0 blue:(51)/255.0 alpha:1]
#define backGayCOLOR [UIColor colorWithRed:(232)/255.0 green:(232)/255.0 blue:(232)/255.0 alpha:1]
@interface TestViewController ()<UITextViewDelegate>

/**
   UITextView输入框的创建
 */
@property(nonatomic,strong) UITextView *jkTextView;
/**
 提示内容
*/
@property(nonatomic,strong) UILabel *placeholderLabel;
/**
  键盘上添加一个view
 */
@property(nonatomic,strong) UIView *jkInputAccessoryView;

@end

@implementation TestViewController

- (void)viewDidLoad {
   [super viewDidLoad];

   self.edgesForExtendedLayout = UIRectEdgeNone;
   self.view.backgroundColor = [UIColor whiteColor];

   [self.view addSubview:self.jkTextView];
   [self.jkTextView addSubview:self.placeholderLabel];
   self.jkTextView.inputAccessoryView = self.jkInputAccessoryView;

}

#pragma mark  textview的变化
-(void)textViewDidChange:(UITextView *)textView{

   self.placeholderLabel.hidden = textView.hasText;
}

-(UITextView *)jkTextView{

  if (!_jkTextView) {

    _jkTextView = [[UITextView alloc]initWithFrame:CGRectMake(0, 0, CIO_SCREEN_WIDTH,CIO_SCREEN_HEIGHT-64)];
    [_jkTextView becomeFirstResponder];
    // UITextView可以垂直滑动弹出键盘
    _jkTextView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
    _jkTextView.alwaysBounceVertical = YES;
    _jkTextView.delegate = self;
    _jkTextView.backgroundColor = [UIColor whiteColor];
    _jkTextView.textColor = TitleBlackCOLOR;
    _jkTextView.font = [UIFont systemFontOfSize:16.f];
   }
  return _jkTextView;
}

-(UILabel *)placeholderLabel{

    if (!_placeholderLabel) {

       _placeholderLabel = [[UILabel alloc]initWithFrame:CGRectMake(5, 9, CIO_SCREEN_WIDTH-10, 22)];
       _placeholderLabel.text = @"分享新鲜事";
       _placeholderLabel.textColor = backGayCOLOR;
       _placeholderLabel.font = [UIFont systemFontOfSize:20];
     }

  return _placeholderLabel;
}

-(UIView *)jkInputAccessoryView{

   if (!_jkInputAccessoryView) {

      _jkInputAccessoryView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CIO_SCREEN_WIDTH, 44)];
      _jkInputAccessoryView.backgroundColor = [UIColor redColor];
    }
   return _jkInputAccessoryView;
 }

@end

3.2.切换自定义键盘(TestViewController)

#import "TestViewController.h"
#import "UIView+JKUiviewExtension.h"

#define CIO_SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define CIO_SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define TitleBlackCOLOR [UIColor colorWithRed:(51)/255.0 green:(51)/255.0 blue:(51)/255.0 alpha:1]
#define backGayCOLOR [UIColor colorWithRed:(232)/255.0 green:(232)/255.0 blue:(232)/255.0 alpha:1]

@interface TestViewController ()<UITextViewDelegate>

 /**
     UITextView输入框的创建
   */
   @property(nonatomic,strong) UITextView *jkTextView;
   /**
      提示内容
    */
   @property(nonatomic,strong) UILabel *placeholderLabel;
   /**
       键盘上添加一个view
    */
    @property(nonatomic,strong) UIView *tooBarView;
    @property(nonatomic,strong) UIButton *tooBarViewBtn;

// 自定义键盘
@property(nonatomic,strong) UIView *keyBoardView;

@end

@implementation TestViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  self.edgesForExtendedLayout = UIRectEdgeNone;
  self.view.backgroundColor = [UIColor whiteColor];

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

  [self.view addSubview:self.jkTextView];
  [self.jkTextView addSubview:self.placeholderLabel];
  [self.view addSubview: self.tooBarView];
  [self.tooBarView addSubview:self.tooBarViewBtn];
}

 #pragma mark 切换键盘
 -(void)switchKeyBoard{

   // 1.关闭键盘
   [self.jkTextView resignFirstResponder];

   // 2.设置inputView
   self.jkTextView.inputView = (self.jkTextView.inputView == nil) ? self.keyBoardView : nil;

  // 3.从新召唤出键盘
  [self.jkTextView becomeFirstResponder];
 }

 #pragma mark 监听键盘
 //实现接收到通知时的操作
 -(void)keyBoardChange:(NSNotification *)notification
 {
   //获取键盘弹出或收回时frame
   CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

   //获取键盘弹出所需时长
  float duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];

  NSLog(@"键盘的弹出的时间=%lf",duration);

  /*
    工具条回弹是因为执行了两次动画, 而系统自带的键盘的动画节奏(曲线) 7
    7在apple API中并没有提供给我们, 但是我们可以使用
    7这种节奏有一个特点: 如果连续执行两次动画, 不管上一次有没有执行完毕, 都会立刻执行下一次
    也就是说上一次可能会被忽略

    如果将动画节奏设置为7, 那么动画的时长无论如何都会自动修改为0.5

    UIView动画的本质是核心动画, 所以可以给核心动画设置动画节奏
  */
 // 1.取出键盘的动画节奏
 float curve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] floatValue];

 [UIView animateWithDuration:duration animations:^{
  
  // 2.设置动画节奏
  [UIView setAnimationCurve:curve];
  
  self.tooBarView.y = keyboardFrame.origin.y - 64 - 44;
  
 }];
}

#pragma mark  textview的变化
-(void)textViewDidChange:(UITextView *)textView{

    self.placeholderLabel.hidden = textView.hasText;
}

-(UITextView *)jkTextView{

   if (!_jkTextView) {
  
  _jkTextView = [[UITextView alloc]initWithFrame:CGRectMake(0, 0, CIO_SCREEN_WIDTH,CIO_SCREEN_HEIGHT-64)];
  [_jkTextView becomeFirstResponder];
  // UITextView可以垂直滑动弹出键盘
  _jkTextView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
  _jkTextView.alwaysBounceVertical = YES;
  _jkTextView.delegate = self;
  _jkTextView.backgroundColor = [UIColor whiteColor];
  _jkTextView.textColor = TitleBlackCOLOR;
  _jkTextView.font = [UIFont systemFontOfSize:16.f];
}

 return _jkTextView;
}

-(UILabel *)placeholderLabel{

   if (!_placeholderLabel) {
  
   _placeholderLabel = [[UILabel alloc]initWithFrame:CGRectMake(5, 9, CIO_SCREEN_WIDTH-10, 22)];
   _placeholderLabel.text = @"分享新鲜事";
   _placeholderLabel.textColor = backGayCOLOR;
   _placeholderLabel.font = [UIFont systemFontOfSize:20];
  }

 return _placeholderLabel;
}

-(UIView *)tooBarView{

   if (!_tooBarView) {

     _tooBarView = [[UIView alloc]initWithFrame:CGRectMake(0, CIO_SCREEN_HEIGHT-64-44, CIO_SCREEN_WIDTH, 44)];
     _tooBarView.backgroundColor = [UIColor redColor];
   }
  return _tooBarView;
 }

 -(UIButton *)tooBarViewBtn{

    if (!_tooBarViewBtn) {
  
       _tooBarViewBtn = [[UIButton alloc]initWithFrame:CGRectMake(CIO_SCREEN_WIDTH-150, 0, 100, 44)];
       [_tooBarViewBtn addTarget:self action:@selector(switchKeyBoard) forControlEvents:UIControlEventTouchUpInside];
       [_tooBarViewBtn setTitle:@"切换键盘" forState:UIControlStateNormal];
       _tooBarViewBtn.backgroundColor = [UIColor purpleColor];
    }
   return _tooBarViewBtn;
 }

 -(UIView *)keyBoardView{

     if (!_keyBoardView) {
  
         _keyBoardView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CIO_SCREEN_WIDTH, 100)];
        _keyBoardView.backgroundColor = [UIColor brownColor];
     }

   return _keyBoardView;
 }

 @end

最后编辑于：2018.01.22 16:23:08

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(Swift&OC)UITextView的的使用技巧

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