摘要：
#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWith... 阅读全文
摘要：
#import "ViewController.h"#import "Person.h"#import "Student.h"@interface ViewController (){ NSString *_text;}@property (weak, nonatomic) IBOutlet ... 阅读全文