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目的：希望将XCode默认代码中类似以下代码
if(<#condition#>){
<#statements#>
}
中的左花括号，替换成下面这种默认格式。
<#statements#>
}
if(<#condition#>)
{
<#statements#>
}
{
<#statements#>
}
XCode4.3中，左花括号分为两种，一种是在文件模版中，比如*.h和*.m文件默认代码中的左花括号。
这种修改参见以下连接：
【转】xcode4自定义文件模板(Creating Custom Xcode 4 File Templates)
另一种，就是if、switch这类代码块中，这类的模版文件路径如下：
/Applications/Xcode.app/Contents/PlugIns/IDECodeSnippetLibrary.ideplugin/Contents/Resources/SystemCodeSnippets.codesnippets
以if代码块为例，在此文件中找到以下代码：
2<key>IDECodeSnippetVersion</key>
3<integer>1</integer>
4<key>IDECodeSnippetCompletionPrefix</key>
5<string>if</string>
6<key>IDECodeSnippetContents</key>
7<string>if(<#condition#>){
8<#statements#>
9}</string>
10<key>IDECodeSnippetIdentifier</key>
11<string>D70E6D11-0297-4BAB-88AA-86D5D5CBBC5D</string>
12<key>IDECodeSnippetLanguage</key>
13<string>Xcode.SourceCodeLanguage.C</string>
14<key>IDECodeSnippetSummary</key>
15<string>Usedforexecutingcodeonlywhenacertainconditionistrue.</string>
16<key>IDECodeSnippetTitle</key>
17<string>IfStatement</string>
18<key>IDECodeSnippetCompletionScopes</key>
19<array>
20<string>CodeBlock</string>
21</array>
22</dict>
将第7行左花括号左边的空格改成回车即可，完成后如下。
2<key>IDECodeSnippetVersion</key>
3<integer>1</integer>
4<key>IDECodeSnippetCompletionPrefix</key>
5<string>if</string>
6<key>IDECodeSnippetContents</key>
7<string>if(<#condition#>)
8{
9<#statements#>
10}</string>
11<key>IDECodeSnippetIdentifier</key>
12<string>D70E6D11-0297-4BAB-88AA-86D5D5CBBC5D</string>
13<key>IDECodeSnippetLanguage</key>
14<string>Xcode.SourceCodeLanguage.C</string>
15<key>IDECodeSnippetSummary</key>
16<string>Usedforexecutingcodeonlywhenacertainconditionistrue.</string>
17<key>IDECodeSnippetTitle</key>
18<string>IfStatement</string>
19<key>IDECodeSnippetCompletionScopes</key>
20<array>
21<string>CodeBlock</string>
22</array>
23</dict>
参考资料：http://stackoverflow.com/questions/5120343/xcode-4-with-opening-brace-on-new-line