摘要：
关联对象(Associated Objects)extension UIViewController { private struct AssociatedKeys { static var DescriptiveName = "nsh_DescriptiveName" }... 阅读全文
摘要：
A TRIP DOWN MEMORY LANE@interface Kraken : NSObject@end@implementation Kraken+ (instancetype)sharedInstance { static Kraken *sharedInstance = nil; ... 阅读全文