cocos2dのsleep
float d = 0.25; //the duration in seconds of the delay [self runAction:[CCDelayTime actionWithDuration:d]];
[NSThread sleepForTimeInterval:0.5];
cocos2dでalert
http://www.cocos2d-iphone.org/forum/topic/991
cocos2dでUIPicker
http://stackoverflow.mobi/question594311_Is-it-possible-to-use-UIPickerView-in-cocos2d-.aspx