我实现了这段代码,但是在我按下UITextfield中的Delete按钮之前,退格键不起作用
我想使用Backspace删除。
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSCharacterSet *myCharSet = [NSCharacterSet characterSetWithCharactersInString:_demo_str];
for (int i = 0; i < [string length]; i++) {
unichar c = [string characterAtIndex:i];
if ([myCharSet characterIsMember:c]) {
return YES;
}
}
return NO;
}
最佳答案
试试这个代码。这对我有用
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSCharacterSet *myCharSet = [NSCharacterSet characterSetWithCharactersInString:_demo_str];
for (int i = 0; i < [string length]; i++) {
unichar c = [string characterAtIndex:i];
if ([myCharSet characterIsMember:c]) {
return YES;
}
else
{
return NO;
}
}
return YES;
}
关于ios - UItextfield shouldChangeCharactersInRange方法BackSpace不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27329094/