iOS 判断字符串中是否是纯数字

//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:str1] || ![self isPureFloat:str1])

{

alert.text = @"警告:含非法字符，请输入纯数字！";

return;

}