特性

• 占位文字上浮
• 输入内容错误时，下方显示提示信息
• 输入框右下角显示字数限制
• 显示历史输入记录列表，方便用户输入
• 线型边框，输入时/错误时改变线条颜色

预览

ezgif.com-resize.gif

使用

    YJJTextField *textField = [YJJTextField yjj_textField];
    textField.frame = CGRectMake(0, 60, self.view.frame.size.width, 80);
    textField.maxLength = 11;
    textField.errorStr = @"字数长度不得超过11位";
    textField.placeholder = @"请输入用户名";
    textField.historyContentKey = @"userName";
    [self.view addSubview:textField];

如何实现历史记录列表

1. 用户输入完成之后进行保存，此处用NSUserDefaults进行存储

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *originalDic = [defaults objectForKey:@"historyContent"];
    if (originalDic == nil) {  // 如果系统中没有记录
        NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithCapacity:0];
        for (YJJTextField *textField in self.textFieldArr) {
            // 用数组存放输入的内容，并作为保存字典的Value，Key为用户在创建时自己指定
            NSArray *array = [NSArray arrayWithObject:textField.textField.text];
            [dic setObject:array forKey:textField.historyContentKey];
        }
        [defaults setObject:dic forKey:@"historyContent"];
    }else{
        __block NSMutableDictionary *newDic = [NSMutableDictionary dictionaryWithCapacity:0];
        for (YJJTextField *textField in self.textFieldArr) {
            // 遍历所有TextField，取出当前文本框的Key和内容
            NSString *currentKey = textField.historyContentKey;
            NSString *currentText = textField.textField.text;
            
            __block NSMutableArray *contentArray;
            // 遍历已经存在的记录
            [originalDic enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSArray *obj, BOOL * _Nonnull stop) {
                contentArray = [NSMutableArray arrayWithArray:obj];
                if ([key isEqualToString:currentKey]) {    // 如果当前Key和字典中的Key相同，则添加Value
                    [contentArray addObject:currentText];
                    // 去除重复的记录
                    NSSet *set = [NSSet setWithArray:contentArray];       
                    contentArray = (NSMutableArray *)set.allObjects;
                    [newDic setObject:contentArray forKey:currentKey];
                    *stop = YES;
                }
            }];
        }
        [defaults setObject:newDic forKey:@"historyContent"];
    }

2. 显示历史记录列表
   1. 在用户开始编辑时，去NSUserDefaults中读取数据

self.historyContentArr = nil;
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSDictionary *dic = [defaults objectForKey:@"historyContent"];
    for (NSString *string in dic.allKeys) {
        if ([string isEqualToString:key]) {
            self.historyContentArr = dic[string];
            break;
        }
    }

2. 如果数据不为空，则创建`UITableView`，实现数据源和代理方法，并将其加载到`keyWindow`上

self.window = [UIApplication sharedApplication].keyWindow;
    self.window.backgroundColor = [UIColor clearColor];
    [self.window addSubview:self.tableView];
    self.tableView.frame = CGRectMake(margin, y, self.frame.size.width-margin*2, tableViewH);
    
    [UIView animateWithDuration:animateDuration animations:^{
        self.tableView.alpha = 1.0;
    }];

3. 取消历史记录列表

[UIView animateWithDuration:animateDuration animations:^{
        self.tableView.alpha = 0.0;
    } completion:^(BOOL finished) {
        [self.tableView removeFromSuperview];
        self.window = nil;
    }];

源码

github链接 https://github.com/yjjwxy2/YJJTextField