Modernizing iOS Apps

I spoke about what iOS Developers need to work on to modernize their apps. A large part of my audience were developers working in large corporations, so my focus was on apps with large codebases.

I first addressed the elephant in the room, the iPhone Duo and its many layout forms. One by one, I presented new checklist items, from SceneDelegate migration to Xcode Previews, UIScreen depreciation to Xcode Previews.

Transcript

1. Modernizing iOS Apps Seyfeddin Başsaraç
2. 2024: Calm before the storm
4. Source: Apple 2025: Liquid Glass
5. 2026: iPhone Duo
6. We had more in our hands that needed fixing.
7. R&D Team / Mobile Ecosystem Expert
8. 16 Years of iOS
9. SEYFEDDIN BASSARAC MOBILE DEVELOPER CONFERENCE 2025 MAY 2025 nsistanbul.com @SEYFOYUN SEYFEDD.IN
10. SEYFEDDIN BASSARAC @SEYFOYUN MOBILE DEVELOPER CONFERENCE 2025 SEYFEDD.IN MAY 2025
11. SEYFEDDIN BASSARAC @SEYFOYUN MOBILE DEVELOPER CONFERENCE 2025 SEYFEDD.IN MAY 2025
13. ’ We ll go one by one, starting with:
14. Elephant in the Room
15. Source: Apple
16. Source: Apple
18. April 2027
19. April 2027: Liquid Glass Deadline Also
20. Source: Apple
21. Source: Apple
22. No more custom bars
23. Alla Efimchuck - Pinterest
24. Xcode 27: SceneDelegate is required
25. heycar.co.uk / BMW
26. iPhone Duo
27. Source: Apple
28. Source: Apple
29. Source: Apple
30. Source: Apple
31. Source: Apple
32. Source: Apple
33. Source: Apple
34. Source: Apple
35. Source: Apple
36. Where to start?
37. Start with Safe Areas + Layout Margins
38. Source: Apple
39. Source: Apple
40. Source: Apple Reduce Transparency
41. Source: Apple
42. Use system modal presentations
43. Wrap modals in UINavigationControllers
44. Source: Apple
45. No more UIScreen.main Access screen only for screen specific value, not adaptive layout.
46. ’ Use view s bounds in viewDidLayoutSubviews / layoutSubviews
47. iOS 18+ Automatic Trait Tracking
48. Source: Apple
49. Source: Apple
50. Source: Apple Size Classes
51. Orientations are not valid anymore
52. Device Idioms = phone
53. Source: Apple Many screens = More testing
54. Designs get more complicated.
55. Previews and Snapshots
59. Dependency-free, agnostic views
61. Faster performance, especially in SwiftUI
62. Observation framework
64. iOS 18+ View Controller
65. On UIKit, use UIStackViews
66. XIBs and Storyboards are dead.
67. Still, previews are HARD to run.
68. Preview Targets
70. Snapshot Tests
71. swift-snapshot-testing framework
72. Mock Data -> Generate View Snapshots
73. Is Architecture important?
74. Architecture is still very important.
75. SOLID Principles
76. Source: Apple
77. Adaptive Layouts
78. Responsive Grid
79. Source: Apple
80. UITableViews are dead.
81. Migrate to UICollectionView + CompositionalLayout
82. Fixed Header Lists
83. Source: Apple
85. Split View Controllers
86. Source: Apple
87. UITableViews are dead?
89. Source: Apple Done with Duo.
90. Modularization
91. Targets increase over time.
92. Use less dependencies.
93. String Catalogs
94. Xcode Localization Skill
95. Accessibility
96. Swift Concurrency will be the next big thing.
97. Teşekkürler. Seyfeddin Başsaraç