DatePicker使用

// 创建时间选择器
    UIDatePicker *picker = [[UIDatePicker alloc] init];
    
    // 设置时间格式为只显示日期
    picker.datePickerMode = UIDatePickerModeDate;
    // 显示中文
    picker.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"ZH-CN"];
    
    // 设置键盘按为datePicker
    self.inputField.inputView = picker;
    
    // 创建工具条
    UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    
    // 设置工具条背景色
    toolbar.tintColor = [UIColor orangeColor];
    
    // 创建UIbarButtonItem   
    UIBarButtonItem *item1 = [[UIBarButtonItem alloc] initWithTitle:@"上一个" style:UIBarButtonItemStylePlain target:self action:@selector(previousBtn)];
    UIBarButtonItem *item2 = [[UIBarButtonItem alloc] initWithTitle:@"下一个" style:UIBarButtonItemStylePlain target:self action:@selector(previousBtn)];
    UIBarButtonItem *item3 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    UIBarButtonItem *item4 = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(previousBtn)];
    
    // 给工具条添加子控件
    toolbar.items = @[item1,item2, item3,item4];
    
    // 给文本框添加辅助视图
    self.inputField.inputAccessoryView = toolbar;