Ios 在文本字段中放置范围和避免特殊字符
我正在iOS上工作。我有一个文本字段,其范围应为7位,并避免使用特殊字符。我只想输入0-9999999之间的数字。请帮忙Ios 在文本字段中放置范围和避免特殊字符,ios,objective-c,uitextfield,uitextfielddelegate,Ios,Objective C,Uitextfield,Uitextfielddelegate,我正在iOS上工作。我有一个文本字段,其范围应为7位,并避免使用特殊字符。我只想输入0-9999999之间的数字。请帮忙 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { if(range.length + range.location > textField.te
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(range.length + range.location > textField.text.length)
{
return NO;
}
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return newLength <= 7;
}
-(BOOL)textField:(UITextField*)textField应更改字符范围:(NSRange)范围替换字符串:(NSString*)字符串
{
if(range.length+range.location>textField.text.length)
{
返回否;
}
NSUInteger newLength=[textField.text length]+[string length]-range.length;
在textfield委托方法中返回newLength,shouldChangeCharactersInRange
这将只允许0-9个数字,不允许字母,也不允许特殊字符
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *aCharacterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
for (int i = 0; i < [string length]; i++) {
unichar aCharacter = [string characterAtIndex:i];
if (![aCharacterSet characterIsMember:aCharacter]) {
return NO;
}
return YES;
}
}
-(BOOL)textField:(UITextField*)textField应更改字符范围:(NSRange)范围替换字符串:(NSString*)字符串
{
NSCharacterSet*aCharacterSet=[NSCharacterSet characterSetWithCharactersInString:@“0123456789”];
对于(int i=0;i<[字符串长度];i++){
unichar aCharacter=[字符串字符索引:i];
if(![aCharacterSet特征成员:aCharacter]){
返回否;
}
返回YES;
}
}
使用此
#define acceptableCharacterSet @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:acceptableCharacterSet] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
if(![string isEqualToString:filtered])
return NO;
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return (newLength > 7) ? NO : YES;
}
但是我想要什么?你是说maxLength?是的,这是我的问题问题问题是,我返回了过滤后的字符串,但你的解决方案有效。谢谢