我正在尝试创建一个与textField的标签一起使用的下一个按钮。我在空类型方法中有一个:
for (UITextField *textField in self.view.subviews)
{
if ([textField isKindOfClass:[UITextField class]])
{
if([textField isFirstResponder])
{
int i = _textFieldTag; //starts as 0
[[textField viewWithTag:i] resignFirstResponder];
NSString *a = [(UITextField *)[textField viewWithTag:i] text];
NSLog(@"TEXT 01 - %@", a);
i = i + 1;
NSLog(@"TAG 02 - %i", i);
[[textField viewWithTag:i] becomeFirstResponder];
NSString *b = [(UITextField *)[textField viewWithTag:i] text];
NSLog(@"TEXT 02 - %@", b);
}
}
}
问题是,即使i
递增 1,NSString *b
也会返回 nil,并且不会像我期望的那样使该 textField 成为下一个响应者。
它们在那里,标签存在,但不知何故不接受 i 的新值。
有什么想法吗?
尝试替换来自以下位置的所有呼叫:
[textField viewWithTag:i]
自:
[self.view viewWithTag:i]
您应该询问视图 viewWithTag 而不是 UITextField。
你的逻辑不正确,正如@Greg所说,你需要使用[self.view viewWithTag:i]
来获得正确的观点。此外,为 self.view 提供一个不同于任何文本字段标签的标签(您收到错误是因为 self.view 的默认标签为 0)。我认为您希望您的逻辑看起来像这样:
-(IBAction)nextField:(id)sender {
int i;
for (UITextField *textField in self.view.subviews) {
if ([textField isKindOfClass:[UITextField class]] && [textField isFirstResponder]) {
[textField resignFirstResponder];
NSString *a = textField.text;
NSLog(@"TEXT 01 - %@", a);
//i = textField.tag + 1; // use this line if you don't want to go back to the first text field
i = (textField.tag == 4)? 0 : textField.tag + 1; //use this line if you want to cycle back to the first text field when you are on the last one. Replace the 4 with whatever is your highest tag. This also assumes that the tag of the first text field is 0.
}
}
NSLog(@"TAG 02 - %i", i);
[[self.view viewWithTag:i] becomeFirstResponder];
NSString *b = [(UITextField *)[self.view viewWithTag:i] text];
NSLog(@"TEXT 02 - %@", b);
}