英文原文：In iOS 7 and later, if you ask for the MAC address of an iOS device, the system returns the value 02:00:00:00:00:00. If you need to identify the device, use the identifierForVendor property of UI
1.最基本的写法+ (Singleton *)defaultSingleton{ static Singleton *singleton = nil; if (singleton == nil) { singleton = [[Singleton alloc] init];
//获取当前设备可用内存及所占内存的头文件#import <sys/sysctl.h>#import <mach/mach.h> // 获取当前设备可用内存(单位：MB）- (double)availableMemory{ vm_statistics_data_t vmStats; mach_msg_type_number_t infoCo
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