@xcode黑科技
1开多一个模拟器：open -n /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app
开3个：open -n /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app&open -n /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app&open -n /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app
@数据
1xcode模拟器插件路径
~/Library/Application Support/Developer/Shared/Xcode/Plug-ins
@xcode调试
注意点：
1 Po值： nil就是0,而不是空值
@快捷键
@技巧
1分隔符
#pragma mark xxx //普通分割
#pragma mark - xxx //有线分割
小细节
1target搜索
