Make the default button size configurable (#188)

Make default button size configurable

Example/JJFloatingActionButton/ConfigurationExampleViewController.swift

@@ -36,8 +36,6 @@ internal class ConfigurationExampleViewController: UIViewController {
         view.addSubview(actionButton)
 
         actionButton.translatesAutoresizingMaskIntoConstraints = false
-        actionButton.widthAnchor.constraint(equalToConstant: 65).isActive = true
-        actionButton.heightAnchor.constraint(equalToConstant: 65).isActive = true
         if #available(iOS 11.0, *) {
             actionButton.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 16).isActive = true
             actionButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -16).isActive = true
@@ -48,6 +46,7 @@ internal class ConfigurationExampleViewController: UIViewController {
     }
 
     fileprivate func configureActionButton() {
+        actionButton.buttonDiameter = 65
         actionButton.overlayView.backgroundColor = UIColor(hue: 0.31, saturation: 0.37, brightness: 0.10, alpha: 0.30)
         actionButton.buttonImage = #imageLiteral(resourceName: "Dots")
         actionButton.buttonColor = .red

Example/Tests/JJFloatingActionButtonSpec.swift

@@ -479,5 +479,33 @@ class JJFloatingActionButtonSpec: QuickSpec {
                 expect(action).toEventually(equal("done!"))
             }
         }
+
+        describe("JJFloatingActionButton using layout constraints") {
+            let superviewFrame = CGRect(origin: .zero, size: CGSize(width: 200, height: 300))
+
+            var actionButton: JJFloatingActionButton!
+            var superview: UIView!
+
+            beforeEach {
+                superview = UIView(frame: superviewFrame)
+                superview.backgroundColor = .white
+
+                actionButton = JJFloatingActionButton()
+                superview.addSubview(actionButton)
+
+                actionButton.translatesAutoresizingMaskIntoConstraints = false
+                actionButton.leadingAnchor.constraint(equalTo: superview.leadingAnchor, constant: 16).isActive = true
+                actionButton.bottomAnchor.constraint(equalTo: superview.bottomAnchor, constant: -16).isActive = true
+            }
+
+            it("looks correct") {
+                expect(superview) == snapshot()
+            }
+
+            it("looks correct when diameter is set") {
+                actionButton.buttonDiameter = 100
+                expect(superview) == snapshot()
+            }
+        }
     }
 }

Sources/JJFloatingActionButton.swift

@@ -117,6 +117,16 @@ import UIKit
         }
     }
 
+    /// The default diameter of the floating action button.
+    /// This is ignored if the size is defined by autolayout.
+    /// Default is `56`.
+    ///
+    @objc @IBInspectable public dynamic var buttonDiameter: CGFloat = 56 {
+        didSet {
+            invalidateIntrinsicContentSize()
+        }
+    }
+
     /// The size of an action item in relation to the floating action button.
     /// Default is `0.75`.
     ///
@@ -356,7 +366,7 @@ extension JJFloatingActionButton {
     /// The natural size for the floating action button.
     ///
     open override var intrinsicContentSize: CGSize {
-        return CGSize(width: 56, height: 56)
+        return CGSize(width: buttonDiameter, height: buttonDiameter)
     }
 }