ios - Missing return UITableViewCell -

i sure question have been asked before can't find answer solves problem nested if-else , switch-case logic.
have uitableview 2 sections, each sections has 2 custom cells. it. 4 cells. no matter "missing return in function expected return uitableviewcell"

question how can change setup else statement @ bottom satisfy swift logic?

any appreciated

override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      if indexpath.section == 0{          switch (indexpath.row) {         case 0:             let cell0: settingscell! = tableview.dequeuereusablecellwithidentifier("cell0", forindexpath: indexpath) as! settingscell         cell0.backgroundcolor = uicolor.redcolor()         break          case 1:             let cell1: settingscell! = tableview.dequeuereusablecellwithidentifier("cell1", forindexpath: indexpath) as! settingscell         cell1.backgroundcolor = uicolor.whitecolor()          break          default:             break         }     }      if indexpath.section == 1{          switch (indexpath.row) {         case 0:             let cell10: settingscell! = tableview.dequeuereusablecellwithidentifier("cell10", forindexpath: indexpath) as! settingscell         cell10.backgroundcolor = uicolor.redcolor()         break          case 1:             let cell11: settingscell! = tableview.dequeuereusablecellwithidentifier("cell11", forindexpath: indexpath) as! settingscell         cell11.backgroundcolor = uicolor.whitecolor()          break          default:             break          }     } } 

• declare cell @ start of method,
• assign value cell depending on section , row number,
• throw fatalerror() in cases "should not occur",
• return cell.

also note break statements not needed. default behavior in swift not fall through next case.

override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      let cell: settingscell      switch(indexpath.section) {     case 0:         switch (indexpath.row) {         case 0:             cell = tableview.dequeuereusablecellwithidentifier("cell0", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.redcolor()          case 1:             cell = tableview.dequeuereusablecellwithidentifier("cell1", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.whitecolor()          default:             fatalerror("unexpected row \(indexpath.row) in section \(indexpath.section)")         }     case 1:         switch (indexpath.row) {         case 0:             cell = tableview.dequeuereusablecellwithidentifier("cell10", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.redcolor()          case 1:             cell = tableview.dequeuereusablecellwithidentifier("cell11", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.whitecolor()          default:             fatalerror("unexpected row \(indexpath.row) in section \(indexpath.section)")          }     default:         fatalerror("unexpected section \(indexpath.section)")      }     return cell } 

the fatalerror() error function marked @noreturn, compiler knows program execution not continue default cases. (this helps find logic errors in program.)

the compiler verifies value assigned cell in other cases.

the possibility initialize constant (let cell ...) in way new in swift 1.2.

---

alternatively, can create cell , return "immediately" in each case:

override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      switch(indexpath.section) {     case 0:         switch (indexpath.row) {         case 0:             let cell = tableview.dequeuereusablecellwithidentifier("cell0", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.redcolor()             return cell          case 1:             let cell = tableview.dequeuereusablecellwithidentifier("cell1", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.whitecolor()             return cell          default:             fatalerror("unexpected row \(indexpath.row) in section \(indexpath.section)")         }     case 1:         switch (indexpath.row) {         case 0:             let cell = tableview.dequeuereusablecellwithidentifier("cell10", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.redcolor()             return cell          case 1:             let cell = tableview.dequeuereusablecellwithidentifier("cell11", forindexpath: indexpath) as! settingscell             cell.backgroundcolor = uicolor.whitecolor()             return cell          default:             fatalerror("unexpected row \(indexpath.row) in section \(indexpath.section)")          }     default:         fatalerror("unexpected section \(indexpath.section)")     } } 

again, calling fatalerror() solves "missing return expected" compiler error.

this pattern can useful if there different kinds of cells (with different classes) created in each case.