判断是否为整形：
代码 
- (BOOL)isPureInt:(NSString *)string{
- (BOOL)isPureInt:(NSString *)string{
- NSScanner* scan = [NSScanner scannerWithString:string];
- int val;
- return [scan scanInt:&val] && [scan isAtEnd];
- }
判断是否为浮点形：
代码
- - (BOOL)isPureFloat:(NSString *)string{
- NSScanner* scan = [NSScanner scannerWithString:string];
- float val;
- return [scan scanFloat:&val] && [scan isAtEnd];
- }