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快捷键 【Xcode】1:编辑多范围代码：
control+shift +Click(点击) 或者 control+shift+Up,control+shift+Down,control+shift+left,control+right
2:同一变量同时修改快捷键：control+command+e(需要把变量自动选中定位到)
3:复制/删除行
/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist
在Deletions下面增加：Delete Current Line，值为：

deleteToBeginningOfLine:, moveToEndOfLine:, deleteToBeginningOfLine:, deleteBackward:, moveDown:, moveToBeginningOfLine:

在Insertions and Indentations下面增加：Duplicate Current Line，值为：

selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:

然后重启Xcode，打开设置，Key Bindings，找到“Delete Current Line”和”Duplicate Current Line”这两项，设置为自己想要的快捷键。
我设置的值是：command+delete（删除行）
option+s(复制行)
3:移动行
找到Xcode中的自带的配置文件：
/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/
Resources/IDETextKeyBindingSet.plist
用文本编辑IDETextKeyBindingSet.plist，并添加以下代码：

GDI Direction GDI Duplicate Current Line selectLine:, copy:, moveToEndOfLine:,insertNewline:, paste:, deleteBackward: GDI Delete Current Line moveToEndOfLine:, deleteToBeginningOfLine:,deleteBackward:,moveDown:,moveToEndOfLine: GDI Move Current Line Up selectLine:, cut:, moveUp:, moveToBeginningOfLine:, insertNewLine:, paste:, moveBackward: GDI Move Current Line Down selectLine:, cut:, moveDown:, moveToBeginningOfLine:, insertNewLine:, paste:, moveBackward: GDI Insert Line Above moveUp:, moveToEndOfLine:, insertNewline: GDI Insert Line Below moveToEndOfLine:, insertNewline:

重启Xcode，在Xcode菜单中，打开Preferences，选中Key Binding，在右上方搜索GDI,设置对应快捷键
我设置的是 option+command+o(上移行)， option+command+o(下移行)，