动态修改可变数组元素

1、

NSMutableArray<NSString *> *array = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", nil];
    for (NSString *str in array.reverseObjectEnumerator) {
        NSLog(@"%@", str);
        if ([str isEqualToString:@"2"]) {
            [array removeObject:str];
        }
    }

2、

NSMutableArray<NSString *> *array = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", nil];
    [array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if ([obj isEqualToString:@"2"]) {
            [array removeObject:obj];
        }
    }];

 参考：

http://weibo.com/touristdiary?refer_flag=1005055013_&is_all=1#_rnd1468202765617