wanglang3081的专栏

1.Object-c do not support multple inheritance. objects that inherit from NSObject directly or indirectly can take advantage of Object-C's distinctive memory managment tool.2.Xcode various build type

2.1 Displaying Alerts with UIAlertViewThe best way to initialize an alert view is, of course, by using its designated initializer:UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Tit