只允许UITextField输入数字

//如果粘贴的是纯数字的话，允许粘贴 否则不允许
//如果输入的非数字返回NO 否则返回YES

 if ([string rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
 {
 // BasicAlert(@"", @"This field accepts only numeric entries.");
 return NO;
 }
 

可定制的方法

 NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];
 if ([string rangeOfCharacterFromSet:set].location != NSNotFound)
 {
 // BasicAlert(@"", @"This field accepts only numeric entries.");
 return NO;
 }
 
 

Allow only Numbers for UITextField input
Check NSString for special characters