我的工作小技巧总结
//这个可以自定义自己输入的集合，我用的比较多
//I want to check an NSString for special characters, i.e. anything expect a-z, A-Z and 0-9.
NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:
@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789"] invertedSet];
if ([aString rangeOfCharacterFromSet:set].location != NSNotFound) {
NSLog(@"This string contains illegal characters");
}
//还有更简单的方法，使用正则判断格式是否正确
if ([aString isMatchedByRegex:@"[^a-zA-Z0-9]"]) {
NSLog(@"This string contains illegal characters");
}
//下面的是用来判断是否输入的是数字
if([packageNumberField.text rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
{｝
//下面是对特殊符号的输入进行判断
NSString *string = ;
NSString *specialCharacterString = @"!~`@#$%^&*-+();:={}[],.<>?\\/\"\'";
NSCharacterSet *specialCharacterSet = [NSCharacterSetcharacterSetWithCharactersInString:specialCharacterString];
if ([string.lowercaseString rangeOfCharacterFromSet:specialCharacterSet].length) {
NSLog(@"contains special characters");
}
//还有一种情况是需要删除特殊符号的情况
#define ACCEPTABLE_CHARACTERS @"!~`@#$%^&*-+();:=_{}[],.<>?\\/|\"\'0123456789"
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSCharacterSet *cs = [NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARACTERS];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
return (![string isEqualToString:filtered]) ? NO : YES;
}
//This code allows only numbers in UITextField input
//这个代理方法可以用来禁止你输入你不想要的字符
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if ([string rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
return NO;
else
return YES;
}
