1.修改iOS RAImage Signature下边距。

RA Image/RA Image/pod.storyboard

@@ -136,7 +136,7 @@
                                 <nil key="highlightedColor"/>
                             </label>
                             <imageView contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="tap_signature" translatesAutoresizingMaskIntoConstraints="NO" id="RqS-9Z-Sx4">
-                                <rect key="frame" x="20" y="410" width="280" height="46"/>
+                                <rect key="frame" x="20" y="410" width="280" height="36"/>
                             </imageView>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Signature" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="dOo-cX-PbJ">
                                 <rect key="frame" x="20" y="385" width="280" height="21"/>
@@ -180,7 +180,7 @@
                             <constraint firstItem="utR-SX-vR9" firstAttribute="centerX" secondItem="fCY-Do-hbH" secondAttribute="centerX" id="VuX-At-TI1"/>
                             <constraint firstItem="a7p-Is-pkn" firstAttribute="top" secondItem="q2P-ID-lRk" secondAttribute="bottom" constant="30" id="XRV-nH-hai"/>
                             <constraint firstItem="fCY-Do-hbH" firstAttribute="leading" secondItem="a7p-Is-pkn" secondAttribute="leading" id="XVf-dN-a5C"/>
-                            <constraint firstItem="utR-SX-vR9" firstAttribute="top" secondItem="RqS-9Z-Sx4" secondAttribute="bottom" constant="5" id="ZR2-Iu-fYw"/>
+                            <constraint firstItem="utR-SX-vR9" firstAttribute="top" secondItem="RqS-9Z-Sx4" secondAttribute="bottom" constant="15" id="ZR2-Iu-fYw"/>
                             <constraint firstItem="fCY-Do-hbH" firstAttribute="top" secondItem="a7p-Is-pkn" secondAttribute="top" id="aYv-1V-hoW"/>
                             <constraint firstItem="utR-SX-vR9" firstAttribute="width" secondItem="kIh-Dp-XpI" secondAttribute="width" id="bWY-vn-l0j"/>
                             <constraint firstItem="rhm-0R-9Ma" firstAttribute="leading" secondItem="a7p-Is-pkn" secondAttribute="leading" id="dxY-PL-cza"/>