判断NSString 是否为数字
//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:insertValue.text] || ![self isPureFloat:insertValue.text]) { resultLabel.textColor = [UIColor redColor]; resultLabel.text = @"警告:含非法字符,请输入纯数字!"; return; } 转载自:http://blog.csdn.net/xuqiang918/article/details/13294421