KKBOX iOS 工程師 Liyao 分享 影片位置 https://youtu.be/nactBecSuYU 相關 Sessions - [What's New in Swift] (https://developer.apple.com/videos/play/wwdc2017/402/) - [What's New in Foundation] (https://developer.apple.com/videos/play/wwdc2017/212/) - [Modernizing Grand Central Dispatch Usage] (https://developer.apple.com/videos/wwdc2017/videos/play/wwdc2017/706/) - [Efficient Interactions with Frameworks] (https://developer.apple.com/videos/wwdc2017/videos/play/wwdc2017/244/)

1. WWDC17 讀書會
Swift & Foundation
Liyao Chen
1
現在 2017.6.30

2. Swift & Foundation
• What’s New in Swift
• What’s New in Foundation
• Efficient Interactions with Frameworks
• Modernizing Grand Central Dispatch Usage
2

3. Outlines
• 無痛升級
• New APIs
• Performance
3

4. 無痛升級
4

5. 無痛升級
• Swift Refactoring Support
• New Build System
• Copy on Write
• Exclusive Access to Memory
5

6. New Build System
6

7. New Build System
7

8. • Shard Build for Coverage Testing
• Indexing While Building
• Faster Generic Code
• Heap alloc -> Stack alloc
New Build System
8

9. Copy on Write
9

10. • Make it easier to reason about local variables
• Enable better programmer optimization
• Enable better compiler optimization
• Enable powerful new language features
Exclusive Access to Memory
10

11. Exclusive Access to Memory
11

12. Exclusive Access to Memory
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13. 13

14. 14

15. 15

16. New APIs
16

17. New APIs
• Private function access control changed
• Class and Subtype Existential
• KeyPaths and KVO
• Encoding & Decoding
• Generics
• String
17

18. 18

19. 19

20. Key Paths and KVO
20

21. 21

22. 22

23. 23

24. 24

25. 25

26. 26

27. 27

28. 28

29. 29

30. Encoding and Decoding
30

31. 31

32. 32

33. 33

34. 34

35. –Mantle, SwiftyJSON
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36. 36

37. String
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38. 38

39. 39

40. 40

41. 41

42. 42

43. 43

44. 44

45. Performance
45

46. Performance
• Memory
• Smaller Binaries
• CPU
46

47. Memory
47

48. 48

49. 49

50. 50

51. 51

52. 52

53. 53

54. 54

55. 55

56. 56

57. 57

58. Text layout and rendering
58

59. Text layout and rendering
59

60. Text layout and rendering
60

61. Text layout and rendering
61

62. Smaller Binaries
62

63. 63

64. 64

65. 65

66. CPU
66

67. GCD
• Parallelism
• Concurrency
• Context switching
67

68. 68

69. 69

70. 70

71. 71

72. 72

73. 73

74. 74

75. 75

76. 76

77. 77

78. 78

79. 79

80. 80

81. 81

82. 82

83. 83

84. 84

85. 85

86. What Are Dispatch Sources
• In short, a dispatch source is an object which monitors for
some type of event.
• When the event occurs, it automatically schedules a block
for execution on a dispatch queue.
• https://www.mikeash.com/pyblog/friday-qa-2009-09-11-
intro-to-grand-central-dispatch-part-iii-dispatch-
sources.html
86

87. What Are Dispatch Sources
87

88. Custom event
88

89. 89

90. 90

91. 91

92. 92

93. 93

94. 94

95. 95

96. 96

97. 97

98. 98

99. 99

100. 100

101. 101

102. 102

103. 103

104. 104

105. 105

106. 106

107. 107

108. Recap
• 無痛升級
• New APIs
• Performance
• Binary size, memory, CPU
108

109. Q and A
109
Liyao Chen
現在
Swift & Foundation
2017.6.30