Applied correct setter and getter convention

Sources/iOS/Material+UIButton.swift

@@ -36,11 +36,11 @@ import UIKit
 public extension UIButton {
   /// Convenience way to change titleLabel font size.
   var fontSize: CGFloat {
-    set {
-      titleLabel?.font = titleLabel?.font?.withSize(newValue) ?? UIFont.systemFont(ofSize: newValue)
-    }
     get {
       return titleLabel?.font?.pointSize ?? UIFont.buttonFontSize
     }
+    set(value) {
+      titleLabel?.font = titleLabel?.font?.withSize(value) ?? UIFont.systemFont(ofSize: value)
+    }
   }
 }

Sources/iOS/Material+UILabel.swift

@@ -36,11 +36,11 @@ import UIKit
 public extension UILabel {
   /// Convenience way to change font size.
   var fontSize: CGFloat {
-    set {
-      font = font?.withSize(newValue) ?? UIFont.systemFont(ofSize: newValue)
-    }
     get {
       return font?.pointSize ?? UIFont.labelFontSize
     }
+    set(value) {
+      font = font?.withSize(value) ?? UIFont.systemFont(ofSize: value)
+    }
   }
 }