Added clear button to text field

Author: lochiego

tips/Base.lproj/Main.storyboard

@@ -57,7 +57,7 @@
                                 <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                 <nil key="highlightedColor"/>
                             </label>
-                            <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" textAlignment="right" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="LvT-mR-pF0">
+                            <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" textAlignment="right" minimumFontSize="17" clearButtonMode="whileEditing" translatesAutoresizingMaskIntoConstraints="NO" id="LvT-mR-pF0">
                                 <rect key="frame" x="150" y="94" width="150" height="30"/>
                                 <animations/>
                                 <fontDescription key="fontDescription" type="system" pointSize="24"/>