EclipseStyleKeyBindings

Step 1:

Edit /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/IDETextKeyBindingSet.plist, add this code:

<key>Customized</key>
<dict>
    <key>Delete Current Line In One Hit</key>
    <string>selectLine:, delete:</string>
</dict>

above last</dict>tag.

Step 2:

Copy EclipseStyle.idekeybindings to ~/Library/Developer/Xcode/UserData/KeyBindings/.

Step 3:

Open Xcode, Preferences...-Key Bndings-Secect EclipseStyle, then restart Xcode.