NSToolBar-设定初始化选中的item
参考资料：http://stackoverflow.com/questions/11004072/nstoolbar-how-do-i-initialise-with-a-selected-item......
NSButton——设定背景图片Scale
参考资料： http://stackoverflow.com/questions/5851923/how-to-scale-axes-independently-at-runtime-on-an-nsbutton......
IAR Error: Unknown or ambiguous symbol. main解决
网上下载了一个程序（含工程），打开一debug，提示：“Error (col 1): Unknown or ambiguous symbol. main”。经查：设置里没有生成debug information解决办法：......
Xcode Warning：Unsupported Configuration Content rectangle解决
参考资料：http://stackoverflow.com/questions/12423654/unsupported-configuration-error-in-cocoa-xcode......
ios7 xib适配statusBar—同时适配ios7和ios6
参考资料：https://developer.apple.com/library/ios/documentation/userexperience/conceptual/TransitionGuide/SupportingEarlieriOS.html......