我试图限制用户可以输入的字符数UITextField在我的内UIAlertView.
我尝试过网络上的一些常见答案。如下图所示：
#define MAXLENGTH 10
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ([textField.text length] > MAXLENGTH) {
textField.text = [textField.text substringToIndex:MAXLENGTH-1];
return NO;
}
return YES;
}
有人能帮忙吗？
.h file
@property (strong,nonatomic) UITextField *alertText;
@interface LocationSearchViewController : UIViewController<UITextFieldDelegate>
.m file
- (IBAction)butPostalCode:(id)sender {
UIAlertView *alrt=[[UIAlertView alloc]initWithTitle:@"" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
alrt.alertViewStyle = UIAlertViewStylePlainTextInput;
[[alrt textFieldAtIndex:0] setPlaceholder:@"Enter postal Code"];
alertText = [alrt textFieldAtIndex:0];
alertText.keyboardType = UIKeyboardTypeNumberPad;
alertText.delegate=self;
alrt.tag=100;
[alrt show];
}
-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(yourtextfieldname.text.length >= 10 && range.length == 0) {
return NO;
}
return YES;
}
Swift
class LocationSearchViewController: UIViewController, UITextFieldDelegate {
Var alertText:UITextField!
}
func butPostalCode(sender: AnyObject) {
var alrt: UIAlertView = UIAlertView(title: "", message: "", delegate: self, cancelButtonTitle: "Cancel", otherButtonTitles: "OK")
alrt.alertViewStyle = .PlainTextInput
alrt.textFieldAtIndex(0).placeholder = "Enter postal Code"
alertText = alrt.textFieldAtIndex(0)
alertText.keyboardType = .NumberPad
alertText.delegate = self
alrt.tag = 100
alrt.show()
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if yourtextfieldname.text.length >= 10 && range.length == 0 {
return false
}
return true
}
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