ios 获取当前设备信息、内存

//在[UIDevice currentDevice]中的属性

@property(nonatomic,readonly,strong) NSString    *name;              // e.g. "My iPhone"
@property(nonatomic,readonly,strong) NSString    *model;             // e.g. @"iPhone", @"iPod touch"
@property(nonatomic,readonly,strong) NSString    *localizedModel;    // localized version of model
@property(nonatomic,readonly,strong) NSString    *systemName;        // e.g. @"iOS"
@property(nonatomic,readonly,strong) NSString    *systemVersion;     // e.g. @"4.0"

#pragma mark-内存获取
double usedMemory()
{
    task_basic_info_data_t taskInfo;

    mach_msg_type_number_t infoCount = TASK_BASIC_INFO_COUNT;

    kern_return_t kernReturn = task_info(mach_task_self(),

                                         TASK_BASIC_INFO,

                                         (task_info_t)&taskInfo,

                                         &infoCount);

    if (kernReturn != KERN_SUCCESS) {
        return NSNotFound;
    }
    return taskInfo.resident_size / 1024.0 / 1024.0;
}