順便打個廣告，敝司 iOS 研發工程師崗位還有一個位置，要求和 隔壁 topic 差不多，只是薪資雙倍而且可遠程。

感覺選的已經都是基礎得不能再基礎的題了，只有幾個為了考察面試者的搜索和學習能力稍有些偏。因為項目剛剛改用 Swift 用不上這些題了所以順便發出來給 V2EX 社區的各位參考下意見。題目主要考察以下幾點：

• 格式的規範性
• 實現方式是否優雅
• 經驗和經驗之外的學習能力
• 解決問題的邏輯

下面是面試題：

Language

1. Declare an NS_OPTIONS type BCLayoutAxis with following values:

• none
• horizontal
• vertical
• all

2. Create string representations for the values above

For debugging, we need string representations ("none", "horizontal", "vertical", "all") instead of original integer values. Use a graceful approach to represent them.

3. Declare a constant value (public/private)

Declare a constant named kBCMyConstant of NSString type with value of myConstantValue, public and private.

4. Create variadic method

5. Create a singleton

6. Concatenate string literals

7. Percentage encoding and decoding

8. Reverse an array

9. Filter objects in an array by value of a property

@interface MyObject : NSObject
@property (nonatomic, assign, readonly) BOOL favorited;
@end

Given an NSArray instance containing several MyObject objects, put the objects of which favorited property are YES into a new NSArray instance.

10. Remove duplicated objects from an array

NSArray *myArray = @[@"a", @"b", @"c", @"a", @"d"];

Create a new NSArray instance from myArray containing @"a", @"b", @"c", @"d" only.

11. Determine if an NSDate instance is in this month

Runtime

1. Swizzle a method

- (void)myMethod;
- (void)bc_myMethod;

2. Determine the type of a property

@property (nonatomic, copy) NSString *myProperty;

3. Determine the caller of a method

Stack, framework, address, class, function, line.