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| import SwiftUI | |
| struct MyCollection: RandomAccessCollection { | |
| let startIndex = 0 | |
| let endIndex = 1000 | |
| subscript(index: Int) -> Int { | |
| print("Access \(index)") | |
| return index | |
| } | |
| } | |
| struct ContentView: View { | |
| var body: some View { | |
| TabView { | |
| NavigationStack { | |
| // Wrapped in a scroll view, LazyVStack only accesses the elements it needs | |
| ScrollView { | |
| LazyVStack { | |
| ForEach(MyCollection(), id: \.self) { index in | |
| let _ = { print("LazyVStack renders \(index)") }() | |
| Text("\(index)").padding() | |
| } | |
| } | |
| }.navigationBarTitle("LazyVStack") | |
| }.tabItem { Text("LazyVStack") } | |
| NavigationStack { | |
| // List always accesses all elements | |
| List(MyCollection(), id: \.self) { index in | |
| let _ = { print("List renders \(index)") }() | |
| Text("\(index)") | |
| }.navigationBarTitle("List") | |
| }.tabItem { Text("List") } | |
| } | |
| } | |
| } |
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| # Indexes accessed during a "scroll to top" gesture performed | |
| # from a LazyVStack scrolled to the end of a list of | |
| # 1_000_000 elements: | |
| 0 | |
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
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| 44 | |
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| 46 | |
| 47 | |
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| 50 | |
| 51 | |
| 52 | |
| 53 | |
| 54 | |
| 55 | |
| 56 | |
| 57 | |
| 58 | |
| 59 | |
| 60 | |
| 61 | |
| 62 | |
| 63 | |
| 64 | |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | |
| 70 | |
| 71 | |
| 72 | |
| 73 | |
| 74 | |
| 75 | |
| 76 | |
| 77 | |
| 78 | |
| 79 | |
| 80 | |
| 81 | |
| 82 | |
| 83 | |
| 84 | |
| 85 | |
| 86 | |
| 87 | |
| 88 | |
| 89 | |
| 90 | |
| 91 | |
| 92 | |
| 93 | |
| 94 | |
| 95 | |
| 96 | |
| 97 | |
| 98 | |
| 99 | |
| 100 | |
| 101 | |
| 102 | |
| 103 | |
| 104 | |
| 105 | |
| 106 | |
| 107 | |
| 108 | |
| 109 | |
| 110 | |
| 111 | |
| 112 | |
| 113 | |
| 114 | |
| 115 | |
| 116 | |
| 117 | |
| 118 | |
| 119 | |
| 120 | |
| 121 | |
| 122 | |
| 123 | |
| 124 | |
| 125 | |
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| 127 | |
| 128 | |
| 129 | |
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| 135 | |
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| 140 | |
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| 144 | |
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| 149 | |
| 150 | |
| 151 | |
| 152 | |
| 153 | |
| 154 | |
| 155 | |
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| 239 | |
| 240 | |
| 241 | |
| 242 | |
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| 246 | |
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| 248 | |
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| 270 | |
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| 311 | |
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| 319 | |
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| 323 | |
| 324 | |
| 325 | |
| 326 | |
| 359 | |
| 360 | |
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| 365 | |
| 366 | |
| 367 | |
| 368 | |
| 369 | |
| 370 | |
| 371 | |
| 372 | |
| 373 | |
| 374 | |
| 414 | |
| 415 | |
| 416 | |
| 417 | |
| 418 | |
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| 420 | |
| 421 | |
| 422 | |
| 423 | |
| 424 | |
| 425 | |
| 426 | |
| 427 | |
| 428 | |
| 429 | |
| 478 | |
| 479 | |
| 480 | |
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| 485 | |
| 486 | |
| 487 | |
| 488 | |
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| 490 | |
| 491 | |
| 492 | |
| 493 | |
| 551 | |
| 552 | |
| 553 | |
| 554 | |
| 555 | |
| 556 | |
| 557 | |
| 558 | |
| 559 | |
| 560 | |
| 561 | |
| 562 | |
| 563 | |
| 564 | |
| 565 | |
| 566 | |
| 636 | |
| 637 | |
| 638 | |
| 639 | |
| 640 | |
| 641 | |
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| 643 | |
| 644 | |
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| 647 | |
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| 651 | |
| 733 | |
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| 985 | |
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| 989 | |
| 990 | |
| 991 | |
| 1127 | |
| 1128 | |
| 1129 | |
| 1130 | |
| 1131 | |
| 1132 | |
| 1133 | |
| 1134 | |
| 1135 | |
| 1136 | |
| 1137 | |
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| 1140 | |
| 1141 | |
| 1142 | |
| 1301 | |
| 1302 | |
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| 1310 | |
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| 1316 | |
| 1503 | |
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| 1735 | |
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| 1750 | |
| 2004 | |
| 2005 | |
| 2006 | |
| 2007 | |
| 2008 | |
| 2009 | |
| 2010 | |
| 2011 | |
| 2012 | |
| 2013 | |
| 2014 | |
| 2015 | |
| 2016 | |
| 2017 | |
| 2018 | |
| 2019 | |
| 2316 | |
| 2317 | |
| 2318 | |
| 2319 | |
| 2320 | |
| 2321 | |
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| 2323 | |
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| 2331 | |
| 2676 | |
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| 2680 | |
| 2681 | |
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| 2684 | |
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| 2690 | |
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| 3094 | |
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| 3577 | |
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| 4137 | |
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| 4785 | |
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| 4791 | |
| 4792 | |
| 4793 | |
| 4794 | |
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| 5537 | |
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| 6409 | |
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| 8594 | |
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| 759652 | |
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| 759654 | |
| 901068 | |
| 901069 | |
| 901070 | |
| 901071 | |
| 901072 | |
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| 901074 | |
| 901075 | |
| 901076 | |
| 901077 | |
| 901078 | |
| 901079 | |
| 901080 | |
| 901081 | |
| 901082 | |
| 901083 | |
| 999986 | |
| 999987 | |
| 999988 | |
| 999989 | |
| 999990 | |
| 999991 | |
| 999992 | |
| 999993 | |
| 999994 | |
| 999995 | |
| 999996 | |
| 999997 | |
| 999998 | |
| 999999 |
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