在我的视图中我有几个UITextFields,我需要显示一些文本输入的键盘,有时需要显示UIDatePicker。
我命令显示DatePicker我为日期UITextField实现了委托,但是一旦我为文本输入选择了另一个UITextField,DatePicker仍然在后台。然后我尝试使用此代码实现另一个UITextField的委托:
- (void)viewDidLoad {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd/MM/yyyy"];
NSString *stringFromDate = [formatter stringFromDate:[NSDate date]];
NSLog(@"IN - AddExpenseViewController::viewDidLoad %s",stringFromDate);
date.text = stringFromDate;
datePicker.hidden = YES;
date.delegate = self;
amount.delegate = self;
isIncome = NO;
[super viewDidLoad]; }
// ...
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
NSLog(@"IN - AddExpenseViewController::textFieldShouldBeginEditing %@",textField.placeholder);
if (![textField.placeholder isEqual:[NSString stringWithFormat:@"Date"]]) {
[self hideDatePicker];
[textField becomeFirstResponder];
return YES;
}
else {
[self showDatePicker];
}
return NO;}
问题是,当我选择日期TextField而不是金额时,委托会在循环中被调用:
2010-12-05 13:15:17.324 AddExpense [1179:207] IN - AddExpenseViewController :: textFieldShouldBeginEditing Amount 2010-12-05 13:15:17.324 AddExpense [1179:207] IN - AddExpenseViewController :: hideDatePicker 2010-12-05 13:15:17.325 AddExpense [1179:207] IN - AddExpenseViewController :: textFieldShouldBeginEditing Amount 2010-12-05 13:15:17.326 AddExpense [1179:207] IN - AddExpenseViewController :: hideDatePicker 2010-12-05 13:15:17.327 AddExpense [1179:207] IN - AddExpenseViewController :: textFieldShouldBeginEditing Amount 2010-12-05 13:15:17.327 AddExpense [1179:207] IN - AddExpenseViewController :: hideDatePicker
并且没有办法阻止它! 我的代码出了什么问题?
提前致谢,AM
答案 0 :(得分:1)
每当您创建UITextField firstReponder时,textFieldShouldBeginEditing:
都会发送给其委托。
临时解决方案可能是
if (![textField.placeholder isEqual:[NSString stringWithFormat:@"Date"]]) {
[self hideDatePicker];
textField.delegate = nil;
[textField becomeFirstResponder];
textField.delegate = self;
return YES;
}
但我建议您重新设计代码,以便从该方法中排除[textField becomeFirstResponder]
。