我有一组 4 个文本字段。我对这些文本字段应用了某些限制,可以通过下面的代码轻松理解。
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString * newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (string.length==0) {
return YES;
}
if (textField == txt_mins) {
return [[AppDelegate sharedInstance] setNumberFormat:textField newString:newString
IntegerLimit:5 FractionLimit:2 NumberType:2];
}
else if (textField == txt_units){
return [[AppDelegate sharedInstance] setNumberFormat:textField newString:newString
IntegerLimit:5 FractionLimit:2 NumberType:2];
}
// Below logic is for All 4 Modifer Textfields
// we are restricting the user to enter only max 2 characters in modifier textfields and
also automatically
// converting each entered character to the uppercase string.
if (textField==txt_modifier1 || textField==txt_modifier2 || textField==txt_modifier3 ||
textField==txt_modifier4) {
// This condition is restricting the user from entering the special characters in the
modifier textfield.
if ([string rangeOfCharacterFromSet:[[NSCharacterSet alphanumericCharacterSet]
invertedSet]].location != NSNotFound) {
// There are non-alphanumeric characters in the replacement string
return NO;
}
else{
NSString *result = [textField.text stringByReplacingCharactersInRange:range
withString:string.uppercaseString];
if (result.length <= 2)
textField.text = result;
return NO;
}
}
return YES;
}
我真正想要的是 txt_modifier1。一旦我在文本字段中键入我的两个字符,焦点就应该转移到下一个文本字段 txt_modifier2 ,对于其他修饰 rune 本字段也是如此。我在 shouldChangeCharactersInRange: 方法中做了这些限制。请建议在我的代码中处理此增强功能的方法。
最佳答案
@property UIView *firstResponder;
- (void) toggleTextfield
{
NSInteger nextTag = self.firstResponder.tag;
nextTag += 1;
UITextField *nextTextField = (UITextField *)[self.view viewWithTag:nextTag];
if (nextTextField)
{
[nextTextField becomeFirstResponder];
}
}
将标记值分配给您想要使用的所有文本字段。
当你想转移焦点时调用这个方法。
在 textFieldDidBeginEditing:
中添加这一行
self.firstResponder = textField;
Replace this code
if (result.length <= 2)
textField.text = result
return NO;
with
if (result.length <= 2)
textField.text = result;
else [self toggleTextfield];
and add this function -
(void)textFieldDidBeginEditienter code hereng:(UITextField *)textField
{
self.firstResponder = textField;
}
关于ios - 将焦点转移到下一个文本字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17142749/