作者: KevinTing
前几天在项目中碰到一个这样的需求:需要在textField中输入日期,输入的时候弹出datePicker选择日期。心想很简单啊,无非就是把textField的inputView属性设置为UIDatePicker的实例即可啊。然后在UIDatePicker的pickerValueChanged事件中更新textField的值就可以了啊。我开始是这么做的:
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. UIDatePicker *picker = [[UIDatePicker alloc] init]; picker.datePickerMode = UIDatePickerModeDate; [picker addTarget:self action:@selector(pickerValueChanged:) forControlEvents:UIControlEventValueChanged]; self.firstTextField.inputView = picker; } - (void)pickerValueChanged:(UIDatePicker *)sender { NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy-MM-dd"]; self.firstTextField.text = [formatter stringFromDate:sender.date]; }
恩,运行的很好。等等,老板来了说一句,这么快搞好了啊,那这个view上面再加几个日期输入框吧。客户查询起始时间,还要有结束时间啊。好吧,这个也不难的,拉一个textField。如法炮制,在viewDidLoad屁股后面加上:
self.secondTextField.inputView = picker;
然后为了避免输入冲突,在textField的delegate方法中记录当前输入框:
- (void)textFieldDidBeginEditing:(UITextField *)textField { self.currentDateTextField = textField; }
并修改pickerValueChanged方法。
- (void)pickerValueChanged:(UIDatePicker *)sender { NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy-MM-dd"]; self.currentDateTextField.text = [formatter stringFromDate:sender.date]; }
ok了。但是,后面做的过程中发现这个界面不只有输入日期的textField,还有其他的普通textField啊。那只能修改currentDateTextField的记录条件了。
- (void)textFieldDidBeginEditing:(UITextField *)textField { if (textField == self.firstTextField || textField == self.secondTextField) { self.currentDateTextField = textField; } }
好的,这个界面搞定了,老板又来说。后面有几个界面也是这样的,需要加几个日期选择输入框。妈蛋啊!那不是又得再其他的viewController中加入这些代码,设置delegate,实现delegate方法。实话说,这代码量也不大啊。但是这个代码放到viewController中,一是无法复用,二是这样写好怂 啊!代码都是一样的,应该抽出来复用啊!
于是,我写了一个textField的category,直接用一个属性datePickerInput来设置UIDatePicker的键盘。下面是头文件:
#import [UIKit/UIKit.h](因识别问题,这里将尖括号改为方括号) @interface UITextField (DatePicker) @property (nonatomic, assign) BOOL datePickerInput; + (UIDatePicker *)sharedDatePicker; @end
下面是m文件:
#import "UITextField+DatePicker.h" @implementation UITextField (DatePicker) // 1 + (UIDatePicker *)sharedDatePicker; { static UIDatePicker *daterPicker = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ daterPicker = [[UIDatePicker alloc] init]; daterPicker.datePickerMode = UIDatePickerModeDate; }); return daterPicker; } // 2 - (void)datePickerValueChanged:(UIDatePicker *)sender { if (self.isFirstResponder) { NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy-MM-dd"]; self.text = [formatter stringFromDate:sender.date]; } } // 3 - (void)setDatePickerInput:(BOOL)datePickerInput { if (datePickerInput) { self.inputView = [UITextField sharedDatePicker]; [[UITextField sharedDatePicker] addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged]; } else { self.inputView = nil; [[UITextField sharedDatePicker] removeTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged]; } } // 4 - (BOOL)datePickerInput { return [self.inputView isKindOfClass:[UIDatePicker class]]; } end
代码很简单,1处是套用单例的写法初始化一个全局的datePicker;2处设置text,此处必须判断是不是isFirstResponder;3和4是setter和getter。
后面再加上日期选择输入框的时候,只需要这样写就行了:
self.firstTextField.datePickerInput = YES; self.secondTextField.datePickerInput = YES;
恩,比之前好多了!
完整的demo项目在这里: https://github.com/tujinqiu/KTTextFieldDatePickerKeyBoard