iOS 获取设备占用内存

获取应用占用内存

1. 获取应用进程占用内存

- (NSUInteger)memoryUsage {
   
    task_vm_info_data_t vmInfo;
    mach_msg_type_number_t count = TASK_VM_INFO_COUNT;
    kern_return_t result = task_info(mach_task_self(), TASK_VM_INFO, (task_info_t)&vmInfo, &count);
    if (result != KERN_SUCCESS) {
   
        return 0;
    }
    // 单位为字节
    return (NSUInteger)vmInfo.phys_footprint; 
}

2. 获取free内存(与xcode基本一致)

- (double)usageComparisonFree {
   
    mach_port_t host_port = mach_host_self();
    mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
    
    vm_size_t page_size;
    vm_statistics64_data_t vminfo;
    host_page_size(host_port, &page_size);
    host_statistics64(host_port, HOST_VM_INFO64, (host_info64_t