<p>不少app中在进行账号的登录时，倘若密码和账号有误或者为空的时候，我们会收到相应的提示语，还有的会有一种抖动效果，</p>    <p style="text-align:center"><img alt="iOS中TextField抖动效果、toast提示语" src="https://simg.open-open.com/show/1e48a1badbafd0a11bdf9cf51295bcc3.gif"></p>    <p><br> 这样的话可以方便用户更直接的知道自己的造作有误；而向分享、评论、登录、注册、收藏等场景中，不论是成功或者失败，为了让用户有更好的用户体验，我们都应该做相应的提示，比如这样：</p>    <p style="text-align:center"><img alt="iOS中TextField抖动效果、toast提示语" src="https://simg.open-open.com/show/46db15583473037458f51a9f41cc36c9.png"></p>    <p style="text-align:center">toast提示语</p>    <p>抖动效果用的是<a href="/misc/goto?guid=4959635053584601895">AFViewShaker</a>,提示语的实现是通过给<a href="/misc/goto?guid=4958870672840018332">MBProgressHUD</a>写一个类目方法。</p>    <p>1，我们先给MBProgressHUD写个类目</p>    <blockquote>     <p>// MBProgressHUD+TVAssistant.h的实现</p>    </blockquote>    <pre>  <code class="language-objectivec">#import "MBProgressHUD.h"    @interface MBProgressHUD (TVAssistant)    -(void)showToastWithText:(NSString *)text;  -(void)showToastWithText:(NSString *)text whileExecutingBlock:(dispatch_block_t)block;  +(MBProgressHUD *)showToastToView:(UIView *)view withText:(NSString *)text;    @end</code></pre>    <blockquote>     <p>// MBProgressHUD+TVAssistant.m的实现</p>    </blockquote>    <pre>  <code class="language-objectivec">-(void)showToastWithText:(NSString *)text  {      [self show:NO];      [self setMode:MBProgressHUDModeText];      self.userInteractionEnabled = NO;      self.detailsLabelText = text;      self.detailsLabelFont = [UIFont boldSystemFontOfSize:16.];     //    设置视图停留的时间      [self hide:YES afterDelay:2.];  }  -(void)showToastWithText:(NSString *)text isAutoHide:(BOOL)isAutoHide  {      [self setMode:MBProgressHUDModeText];      self.userInteractionEnabled = NO;      self.detailsLabelText = text;      self.detailsLabelFont = [UIFont boldSystemFontOfSize:14.];      if (isAutoHide) {          //    设置视图停留的时间          [self hide:YES afterDelay:2.];      }  }    -(void)showToastWithText:(NSString *)text whileExecutingBlock:(dispatch_block_t)block  {      [self setMode:MBProgressHUDModeText];      self.userInteractionEnabled = NO;      self.labelText = text;  //    设置视图停留的时间      dispatch_time_t time3s = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC));      dispatch_after(time3s, dispatch_get_global_queue(0, 0), ^{          [self hide:YES];          dispatch_async(dispatch_get_main_queue(), ^{              block();          });      });  }      +(MBProgressHUD *)showToastToView:(UIView *)view withText:(NSString *)text  {      MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:view animated:YES];      [hud showToastWithText:text];      return hud;  }</code></pre>    <p>2.在ViewController中导入头文件</p>    <pre>  <code class="language-objectivec">#import "MBProgressHUD+TVAssistant.h"  #import "AFViewShaker.h"</code></pre>    <p>创建实例变量</p>    <pre>  <code class="language-objectivec">@property(nonatomic, strong)LTView *userNameView;  @property(nonatomic, strong)LTView *pwdView;  @property(nonatomic, strong)AFViewShaker *shakeAccount;  @property(nonatomic, strong)AFViewShaker *shakePwd;  @property(nonatomic, strong)UIButton *loginButton;</code></pre>    <p>然后我们创建UI</p>    <pre>  <code class="language-objectivec">-(void)createUI{      UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.frame];      imageView.image = [UIImage imageNamed:@"bj3"];      [self.view addSubview:imageView];      _userNameView = [[LTView alloc] initWithFrame:CGRectMake(45, 150, (self.view.frame.size.width -90), 49)];      [self.view addSubview:_userNameView];      _userNameView.iconImageView.image = [UIImage iconWithInfo:TBCityIconInfoMake(@"\U0000e614", 30, [UIColor whiteColor])];        NSDictionary *dic = @{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:15]};      _userNameView.rightTextFiled.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"手机/用户名/邮箱" attributes:dic];      _userNameView.rightTextFiled.tintColor = [UIColor whiteColor];      _userNameView.rightTextFiled.keyboardType = UIKeyboardTypeAlphabet;      _userNameView.rightTextFiled.delegate = self;          _pwdView = [[LTView alloc] initWithFrame:CGRectMake(45, _userNameView.frame.origin.y + _userNameView.frame.size.height, (self.view.frame.size.width -90), 49)];      [self.view addSubview:_pwdView];        _pwdView.iconImageView.image = [UIImage iconWithInfo:TBCityIconInfoMake(@"\U0000e607", 30, [UIColor whiteColor])];      NSDictionary *dic1 = @{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:15]};      _pwdView.rightTextFiled.delegate = self;      _pwdView.rightTextFiled.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"密码" attributes:dic1];      _pwdView.rightTextFiled.tintColor = [UIColor cyanColor];      _pwdView.rightTextFiled.secureTextEntry = YES;        _loginButton = [UIButton buttonWithType:UIButtonTypeSystem];      _loginButton.frame = CGRectMake((self.view.frame.size.width - 230)/2, _pwdView.frame.origin.y + _pwdView.frame.size.height + 30 , _pwdView.frame.size.width, 40);      _loginButton.layer.cornerRadius = 20;      _loginButton.layer.borderWidth = .5;      _loginButton.tag = 1002;      [_loginButton addTarget:self action:@selector(didClickButton:) forControlEvents:UIControlEventTouchUpInside];      _loginButton.titleLabel.font = [UIFont systemFontOfSize:20];      [_loginButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];      _loginButton.layer.borderColor = [UIColor whiteColor].CGColor;      [_loginButton setTitle:@"登录" forState:UIControlStateNormal];        [self.view addSubview:_loginButton];  }</code></pre>    <p>在-(void)loadView方法中调用方法，同时初始化抖动效果</p>    <pre>  <code class="language-objectivec">-(void)loadView{      [super loadView];      [self createUI];        //    给userNameView添加抖动效果      _shakeAccount = [[AFViewShaker alloc] initWithView:_userNameView];      //    给pwdView添加抖动效果      _shakePwd = [[AFViewShaker alloc] initWithView:_pwdView];    }</code></pre>    <p>这时候的的界面是这样的</p>    <p style="text-align:center"><img alt="iOS中TextField抖动效果、toast提示语" src="https://simg.open-open.com/show/0544a5a7736e91955f80b9874971353a.png"></p>    <p>其中，界面上的图标是用的iconfont，我在前面的一篇文章中有介绍过iconfont的使用，可以参考<a href="http://www.open-open.com/lib/view/open1468373425370.html">在iOS开发中使用iconfont图标</a></p>    <p>3.实现登录按钮的点击事件</p>    <pre>  <code class="language-objectivec">-(void)didClickButton:(UIButton *)button{      if ([_userNameView.rightTextFiled.text isEqualToString:@"123"] && [_pwdView.rightTextFiled.text isEqualToString:@"123"]) {          [_shakePwd shake];          [_shakeAccount shake];  //        提示语在视图上显示的时间可以自己在类目中调整          [MBProgressHUD showToastToView:self.view withText:@"用户名或密码错误"];      }     else if (_userNameView.rightTextFiled.text.length == 0  ) {           //        当账号为空时，开始抖动，抖动成功后显示相应的提示语，shakeWithDuration的时间可以自己调，想要抖动效果慢一些的话就将值设得大一些，反之，则设得小一些           [_shakeAccount shakeWithDuration:.5 completion:^{               [MBProgressHUD showToastToView:self.view withText:@"用户名不能为空"];          }];        }else if (_pwdView.rightTextFiled.text.length == 0) {          //        当密码为空时，开始抖动，并显示相应的提示语            [_shakePwd shake];          [MBProgressHUD showToastToView:self.view withText:@"密码不能为空"];        }else{    //        登录成功后显示相应的提示语            [MBProgressHUD showToastToView:self.view withText:@"登录成功"];        }    }</code></pre>    <p>这样简单的抖动效果和相应的toast提示语就实现了。最后的效果如图。</p>    <p style="text-align:center"><img alt="iOS中TextField抖动效果、toast提示语" src="https://simg.open-open.com/show/682b3e892da57eb24c821ee7ef6dfe84.gif"></p>    <p style="text-align:center">效果图</p>    <p><br> <a href="/misc/goto?guid=4959675319080974038">阅读原文</a></p>