Objective c iOS UIPickerView不显示
我制作了一个UITextField,我实现了委托以检测编辑是否应该开始:Objective c iOS UIPickerView不显示,objective-c,Objective C,我制作了一个UITextField,我实现了委托以检测编辑是否应该开始: - (BOOL) textFieldShouldBeginEditing:(UITextField *)textField{ if(textField.tag == TEXT_FIELD_UNION){ self.isUnionPickerActive = YES; [self.textFieldUnionId setInputView:self.pickerUnionId];
- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
if(textField.tag == TEXT_FIELD_UNION){
self.isUnionPickerActive = YES;
[self.textFieldUnionId setInputView:self.pickerUnionId];
}
return YES;
}
所以当编辑应该开始而不是键盘时,我想显示我的UIPickerView
- (UIPickerView *) pickerUnionId {
if(_pickerUnionId){
_pickerUnionId = [[UIPickerView alloc] init];
[_pickerUnionId setDataSource:self];
[_pickerUnionId setShowsSelectionIndicator:YES];
}
return _pickerUnionId;
}
但它并没有表现出来;我做错了什么?这在UIDatePicker上有效,但我需要另一个
问题就在这里:
- (NSArray *) unions{
if(!_unions) _unions = [[NSArray alloc] initWithObjects:@"Item 1", @"Item 2", @"Item 3", @"Item 4", @"Item 6", nil];
return _unions;
}
错过了比赛!所以我是一个傻瓜
- (NSArray *) unions{
if(!_unions) _unions = [[NSArray alloc] initWithObjects:@"Item 1", @"Item 2", @"Item 3", @"Item 4", @"Item 6", nil];
return _unions;
}
这个!缺少,因此数组为空,且未显示请尝试设置UIPickerView帧