development: handle nil values set to BasicCard

Source/BasicCard.swift

@@ -58,6 +58,7 @@ public class BasicCard : MaterialCard {
 	*/
 	public var titleLabel: UILabel? {
 		didSet {
+			if let t = titleLabel {
 				// container
 				if nil == titleLabelContainer {
 					titleLabelContainer = UIView()
@@ -67,12 +68,16 @@ public class BasicCard : MaterialCard {
 				}
 				
 				// text
-			titleLabelContainer!.addSubview(titleLabel!)
-			titleLabel!.setTranslatesAutoresizingMaskIntoConstraints(false)
-			titleLabel!.textColor = MaterialTheme.white.color
-			titleLabel!.backgroundColor = MaterialTheme.clear.color
-			titleLabel!.font = Roboto.mediumWithSize(18)
-			titleLabel!.numberOfLines = 1
+				titleLabelContainer!.addSubview(t)
+				t.setTranslatesAutoresizingMaskIntoConstraints(false)
+				t.textColor = MaterialTheme.white.color
+				t.backgroundColor = MaterialTheme.clear.color
+				t.font = Roboto.mediumWithSize(18)
+				t.numberOfLines = 1
+			} else {
+				titleLabel?.removeFromSuperview()
+				titleLabelContainer?.removeFromSuperview()
+			}
 		}
 	}
 	
@@ -86,6 +91,7 @@ public class BasicCard : MaterialCard {
 	*/
 	public var detailLabel: UILabel? {
 		didSet {
+			if let l = detailLabel {
 				// container
 				if nil == detailLabelContainer {
 					detailLabelContainer = UIView()
@@ -95,14 +101,18 @@ public class BasicCard : MaterialCard {
 				}
 				
 				// text
-			detailLabelContainer!.addSubview(detailLabel!)
-			detailLabel!.setTranslatesAutoresizingMaskIntoConstraints(false)
-			detailLabel!.textColor = MaterialTheme.white.color
-			detailLabel!.backgroundColor = MaterialTheme.clear.color
-			detailLabel!.font = Roboto.lightWithSize(12)
-			detailLabel!.numberOfLines = 0
-			detailLabel!.lineBreakMode = .ByWordWrapping
+				detailLabelContainer!.addSubview(l)
+				l.setTranslatesAutoresizingMaskIntoConstraints(false)
+				l.textColor = MaterialTheme.white.color
+				l.backgroundColor = MaterialTheme.clear.color
+				l.font = Roboto.lightWithSize(12)
+				l.numberOfLines = 0
+				l.lineBreakMode = .ByWordWrapping
 				prepareCard()
+			} else {
+				detailLabel?.removeFromSuperview()
+				detailLabelContainer?.removeFromSuperview()
+			}
 		}
 	}
 	
@@ -111,10 +121,14 @@ public class BasicCard : MaterialCard {
 	*/
 	public var divider: UIView? {
 		didSet {
-			divider!.setTranslatesAutoresizingMaskIntoConstraints(false)
-			divider!.backgroundColor = MaterialTheme.blueGrey.color
-			addSubview(divider!)
+			if let d = divider {
+				d.setTranslatesAutoresizingMaskIntoConstraints(false)
+				d.backgroundColor = MaterialTheme.blueGrey.color
+				addSubview(d)
 				prepareCard()
+			} else {
+				divider?.removeFromSuperview()
+			}
 		}
 	}
 	
@@ -128,6 +142,7 @@ public class BasicCard : MaterialCard {
 	*/
 	public var leftButtons: Array<MaterialButton>? {
 		didSet {
+			if let b = leftButtons {
 				if nil == buttonsContainer {
 					buttonsContainer = UIView()
 					buttonsContainer!.setTranslatesAutoresizingMaskIntoConstraints(false)
@@ -135,6 +150,9 @@ public class BasicCard : MaterialCard {
 					addSubview(buttonsContainer!)
 				}
 				prepareCard()
+			} else {
+				buttonsContainer?.removeFromSuperview()
+			}
 		}
 	}
 	
@@ -143,6 +161,7 @@ public class BasicCard : MaterialCard {
 	*/
 	public var rightButtons: Array<MaterialButton>? {
 		didSet {
+			if let b = rightButtons {
 				if nil == buttonsContainer {
 					buttonsContainer = UIView()
 					buttonsContainer!.setTranslatesAutoresizingMaskIntoConstraints(false)
@@ -150,6 +169,9 @@ public class BasicCard : MaterialCard {
 					addSubview(buttonsContainer!)
 				}
 				prepareCard()
+			} else {
+				buttonsContainer?.removeFromSuperview()
+			}
 		}
 	}