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，
抖动图.gif
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：
toast提示语
抖动效果用的是AFViewShaker,提示语的实现是通过给MBProgressHUD写一个类目方法。
1，我们先给MBProgressHUD写个类目
// MBProgressHUD+TVAssistant.h的实现
#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
// MBProgressHUD+TVAssistant.m的实现
-(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;
}
2.在ViewController中导入头文件
#import "MBProgressHUD+TVAssistant.h"
#import "AFViewShaker.h"
创建实例变量
@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;
然后我们创建UI
-(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];
}
在-(void)loadView方法中调用方法，同时初始化抖动效果
-(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];
}
这时候的的界面是这样的
界面
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，可以参考在iOS开发中使用iconfont图标
3.实现登录按钮的点击事件
-(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"];
}
}
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。
效果图.gif
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