iOS判断NSString 只含有数字

//判断是否为整形：

- (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：

- (BOOL)isPureFloat:(NSString*)string{

NSScanner* scan = [NSScanner
scannerWithString:string];

float val;

return[scan scanFloat:&val] && [scan
isAtEnd];

}

if( ![self
isPureInt:textField.text] || ![self
isPureFloat:textField.text]){

textField.textColor = [UIColor
redColor];

textField.text =
@"警告:含非法字符，请输入纯数字！";

return;

}else{

textField.textColor = [UIColor
blackColor];

if ([textField.text
integerValue]>self.moneyT) {

[SMAlertView
showAlert:[NSString
stringWithFormat:@"退款金额不能超过钱袋的总金额%ld，请重新输入",(long)self.moneyT]];

textField.text=nil;

}else{

self.money = textField.text;

}

}