iOS 常用算法之设计一个算法,验证某字符是否为合法IPV4字符

 1 - (BOOL)verify: (NSString *)ipV4Address {
 2     __block BOOL _filter = YES;
 3     NSArray *array = [ipV4Address componentsSeparatedByString:@"."];
 4     if (array.count == 4) {
 5         [array enumerateObjectsUsingBlock:^(NSString *string, NSUInteger idx, BOOL * _Nonnull stop) {
 6             NSInteger intValue = [string intValue];
 7             if (intValue <= 0 || intValue >= 255) {
 8                 _filter = NO;
 9                 *stop = YES;
10             }
11             if ([[string substringWithRange:NSMakeRange(0, 1)] integerValue] == 0) {
12                 _filter = NO;
13                 *stop = YES;
14             }
15         }];
16     }else {
17         return NO;
18     }
19     return _filter;
20 }