嵌套的UIStackview問題，刪除它們會導致崩潰。如何正確刪除它們？

Question

試圖在不使用UICollectionViews的情況下創建類似表格的電子表格，我決定使用嵌套的UIStackViews。因爲我在UITableViewCell中使用它們，並以編程方式創建它們，所以我必須將它們從單元格中移除，否則，當重繪單元格時，新的視圖將與舊的視圖重疊。

但是，從父視圖中刪除它們時，它崩潰。如何正確刪除嵌套的UIStackViews？

我的代碼來創建嵌套UIStackViews：

 let table = UIStackView() 
     table.axis = .Vertical 
     table.spacing = 8 

     let json = JSON(data: jsonNew) 

     for i in 0..<json["Rows"].count{ 

      let horizontal = UIStackView() 
      horizontal.axis = .Horizontal 
      horizontal.spacing = 8 

      for j in 0..<json["Rows"][i]["Column"].count{ 

       let label = UILabel() 
       label.text = json["Rows"][i]["Column"][j].string! 
       label.lineBreakMode = .ByWordWrapping 
       label.numberOfLines = 0 
       label.font = label.font.fontWithSize(12) 
       horizontal.addArrangedSubview(label) 

      } 

      table.addArrangedSubview(horizontal) 

     } 

這是我如何刪除單元中的所有觀點：

for myview in view.subviews{ 
    myview.removeFromSuperview() 
} 

這是錯誤：

2016-05-17 11:37:58.745 TestProject[678:26088] _UIConstraintBasedLayoutLogUnsatisfiable is OFF 2016-05-17 11:38:16.563 TestProject[678:26088] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '{objective 0x12faebf00: <1100:16, 760:-6.10352e-05, 750:100, 251:563, 250:-512.5> + <760:-1>*0x12ddfbd00:UISV-text-width-disambiguation.negError{id: 13416} + <760:1>*0x12ddfbd00:UISV-text-width-disambiguation.posErrorMarker{id: 13415} + <760:-1>*0x12ddfbd50:UISV-text-width-disambiguation.negError{id: 13431} + <760:1>*0x12ddfbd50:UISV-text-width-disambiguation.posErrorMarker{id: 13430} + <750:1, 250:1>*0x12f80df30.negError{id: 13501} + <750:1, 250:1>*0x12f80f000.negError{id: 13499} + <250:1>*0x12f84df70:UISV-alignment.marker{id: 13578} + <250:4.6875>*0x12f85ee40:UISV-canvas-connection.marker{id: 13524} + <750:1, 250:1>*0x12f873b40.posErrorMarker{id: 13486} + <1100:1>*0x12f8a5730:UIView-Encapsulated-Layout-Width.marker{id: 13587} + <250:-1>*0x12f8b54e0:UISV-alignment.marker{id: 13557} + <250:-4.6875>*0x12f8d1d70:UISV-canvas-connection.marker{id: 13522} + <760:-1>*0x12f904f30:UISV-text-width-disambiguation.negError{id: 13412} + <760:1>*0x12f904f30:UISV-text-width-disambiguation.posErrorMarker{id: 13411} + <760:1>*0x12f904fa0:UISV-spacing.marker{id: 13413} + <251:-1>*0x12f98e950.marker{id: 12953} + <251:1>*0x12f9b0580.marker{id: 12949} + <760:1>*0x12f9cec00:UISV-canvas-connection.marker{id: 13406} + <250:4.6875>*0x12fa05f30:UISV-spacing.marker{id: 13535} + <999:1, 250:-5.6875>*0x12fa11cd0:UISV-fill-proportionally.negError{id: 13530} + <999:1, 250:5.6875>*0x12fa11cd0:UISV-fill-proportionally.posErrorMarker{id: 13529} + <1100:1>*0x12fa146d0.marker{id: 13000} + <750:1, 250:1>*0x12fa27ab0.posErrorMarker{id: 13492} + <1100:-1>*0x12fa3cc90.marker{id: 12998} + <750:1, 250:1>*0x12fa3cd80.negError{id: 13511} + <750:1, 250:1>*0x12fa3ea20.negError{id: 13513} + <250:1>*0x12fa47260:UISV-alignment.marker{id: 13572} + <750:1, 251:1>*0x12fa4e480.negError{id: 13020} + <1100:-1, 251:1>*0x12fa55880.marker{id: 14140} + <250:1>*0x12fa5bc10:UISV-alignment.marker{id: 13581} + <750:1, 250:1>*0x12fa6a5c0.negError{id: 13495} + <750:1, 250:1>*0x12fa711c0.negError{id: 13483} + <994:1, 250:-5.6875>*0x12fa78560:UISV-fill-proportionally.negError{id: 13547} + <994:1, 250:5.6875>*0x12fa78560:UISV-fill-proportionally.posErrorMarker{id: 13546} + <250:-1>*0x12fa7c820:UISV-alignment.marker{id: 13565} + <250:-1>*0x12fa7c870:UISV-alignment.marker{id: 13567} + <250:1>*0x12fa7c8c0:UISV-alignment.marker{id: 13569} + <250:1>*0x12fa7f990:UISV-alignment.marker{id: 13575} + <250:4.6875>*0x12fa7fc20:UISV-spacing.marker{id: 13527} + <250:4.6875>*0x12fa93c40:UISV-spacing.marker{id: 13531} + <750:1, 250:1>*0x12fa94dd0.negError{id: 13517} + <750:-1, 250:4.6875>*0x12fa980e0:UISV-hiding.marker{id: 13550} + <250:-1>*0x12fa98d50:UISV-alignment.marker{id: 13559} + <750:1, 250:1>*0x12fa990f0.negError{id: 13505} + <750:-1, 250:4.6875>*0x12faad3d0:UISV-hiding.marker{id: 13551} + <750:1, 251:1>*0x12fab93e0.negError{id: 13022} + <750:1, 250:1>*0x12fac5ee0.negError{id: 13481} + <250:7>*0x12facbf60:UISV-canvas-connection.marker{id: 13552} + <750:1, 250:1>*0x12fad6cb0.negError{id: 13489} + <250:4.6875>*0x12fadb570:UISV-spacing.marker{id: 13543} + <250:1>*0x12fae21d0:UISV-alignment.marker{id: 13584} + <250:-7>*0x12fae8940:UISV-canvas-connection.marker{id: 13554} + <750:1, 250:1>*0x12faec7c0.negError{id: 13519} + <760:-1>*0x12fc0f8a0:UISV-canvas-connection.marker{id: 13403} + <251:-1>*0x12fc1a8a0.marker{id: 12975} + <760:1>*0x12fc276f0:UISV-spacing.marker{id: 13409} + <760:1>*0x12fc54e40:UISV-spacing.marker{id: 13417} + <760:-1>*0x12fc54e90:UISV-text-width-disambiguation.negError{id: 13429} + <760:1>*0x12fc54e90:UISV-text-width-disambiguation.posErrorMarker{id: 13428} + <251:-1>*0x12fc6dd10.marker{id: 12972} + <1100:1>*0x12fc6e830.marker{id: 12969} + <760:-1>*0x12fc75b80:UISV-text-width-disambiguation.negError{id: 13424} + <760:1>*0x12fc75bf0:UISV-spacing.marker{id: 13425} + <760:-1>*0x12fc78190:UISV-text-width-disambiguation.negError{id: 13420} + <760:1>*0x12fc78190:UISV-text-width-disambiguation.posErrorMarker{id: 13419} + <760:1>*0x12fc78200:UISV-spacing.marker{id: 13421} + <251:-1>*0x12fc8fd20.marker{id: 12957} + <1100:1>*0x12fc95e90.marker{id: 12963} + <250:7>*0x12fc960b0.marker{id: 12955} + <250:4.6875>*0x12fd06e40:UISV-spacing.marker{id: 13533} + <750:1, 250:1>*0x12fd07210.negError{id: 13507} + <996:1, 250:-5.6875>*0x12fd1a3a0:UISV-fill-proportionally.negError{id: 13538} + <996:1, 250:5.6875>*0x12fd1a3a0:UISV-fill-proportionally.posErrorMarker{id: 13537} + <995:1, 250:-5.6875>*0x12fd1b3f0:UISV-fill-proportionally.negError{id: 13542} + <995:1, 250:5.6875>*0x12fd1b3f0:UISV-fill-proportionally.posErrorMarker{id: 13541} + <250:4.6875>*0x12fd1bd50:UISV-spacing.marker{id: 13539} + <993:1, 250:-5.6875>*0x12fd1c370:UISV-fill-proportionally.negError{id: 13549} + <993:1, 250:5.6875>*0x12fd1c370:UISV-fill-proportionally.posErrorMarker{id: 13548} + <250:-1>*0x12fd1e670:UISV-alignment.marker{id: 13561} + <250:-1>*0x12fd1e6c0:UISV-alignment.marker{id: 13563} + <750:0.00277778>*UILabel:0x12f884240'2016-04-11'.Width{id: 13061} + <750:0.00277778>*UILabel:0x12fa2f410'2031839'.Width{id: 13031} + <750:0.00277778>*UILabel:0x12fa2fd90'OTOTAY İÇ VE DIŞ PAZ.A.Ş.'.Width{id: 13037} + <750:0.00277778>*UILabel:0x12fa52010'TL'.Width{id: 13055} + <750:0.00277778>*UILabel:0x12fafa3d0'MAHMUT ÇETİNTÜRK'.Width{id: 13043} + <750:0.00277778>*UILabel:0x12fafa6a0'15000,00'.Width{id: 13049} + <760:0>*UIStackView:0x12fa081c0.Width{id: 13152} + <760:0, 750:-0.00277778>*UIStackView:0x12fb2b740.Width{id: 13067} + <760:0>*UIStackView:0x12fc44970.Width{id: 13322} + <760:0>*UIStackView:0x12fc65df0.Width{id: 13237}}: internal error. Setting empty vector for variable UILabel:0x12f905720'6955677'.Width{id: 13371}.' * First throw call stack: (0x18221ae38 0x18187ff80 0x18221ad80 0x182b52de0 0x182ccf4d4 0x182b4fcc8 0x182b53108 0x182b50d18 0x182b53928 0x182b585e4 0x182b4d010 0x182b4cd78 0x187464c80 0x187357368 0x187356c1c 0x182b4cd50 0x187356ac4 0x1876702c4 0x1873554e8 0x100143634 0x100148164 0x1876b2f40 0x1876b3120 0x1876b6a2c 0x1874a9500 0x1874a923c 0x1874a8ebc 0x187448aa0 0x1876a1a34 0x1876b7b74 0x1874487ac 0x1873580e4 0x184cfea28 0x184cf9634 0x184cf94f4 0x184cf8b24 0x184cf886c 0x184cf1dd8 0x1821d07b0 0x1821ce554 0x1821ce984 0x1820f8d10 0x1839e0088 0x1873c5f70 0x100107234 0x181c968b8) libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

您需要從removeArrangedSubview刪除堆棧視圖，即

for myview in view.subviews{ 
    table.removeArrangedSubview(myview) 
    myview.removeFromSuperview() 
} 

UIStackView是一個非渲染UIView調用addArrangedSubview的時候，所以你不需要調用addSubview系統會自動添加子視圖其觀點heirachy。當刪除排列的子視圖時，必須調用stackView.removeArrangedSubview(view)和view.removeFromSuperview()