//如果粘貼的是純數(shù)字的話，允許粘貼 否則不允許
//如果輸入的非數(shù)字返回NO 否則返回YES
<pre>
if ([string rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound)
{
// BasicAlert(@"", @"This field accepts only numeric entries.");
return NO;
}
</pre>
可定制的方法
<pre>
NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];
if ([string rangeOfCharacterFromSet:set].location != NSNotFound)
{
// BasicAlert(@"", @"This field accepts only numeric entries.");
return NO;
}
</pre>
Allow only Numbers for UITextField input
Check NSString for special characters
