iOS学习爬坑记录13：查看内存使用情况的obj-c和Swift代码

obj-c代码：

#import "mach/mach.h"
#import "memusage.h"

@implementation memusage

static long prevMemUsage = 0;
static long curMemUsage = 0;
static long memUsageDiff = 0;
static long curFreeMem = 0;

-(vm_size_t) freeMemory {
mach_port_t host_port = mach_host_self();
mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
vm_size_t pagesize;
vm_statistics_data_t vm_stat;

host_page_size(host_port, &pagesize);
(void) host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
return vm_stat.free_count * pagesize;
}

-(vm_size_t) usedMemory {
struct task_basic_info info;
mach_msg_type_number_t size = sizeof(info);
kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &size);
return (kerr == KERN_SUCCESS) ? info.resident_size : 0; // size in bytes
}

-(void) captureMemUsage {
prevMemUsage = curMemUsage;
curMemUsage = [self usedMemory];
memUsageDiff = curMemUsage - prevMemUsage;
curFreeMem = [self freeMemory];

}

-(NSString*) captureMemUsageGetString{
return [self captureMemUsageGetString: @"Memory used %7.1f (%+5.0f), free %7.1f kb"];
}

-(NSString*) captureMemUsageGetString:(NSString*) formatstring {
[self captureMemUsage];
return [NSString stringWithFormat:formatstring,curMemUsage/1000.0f, memUsageDiff/1000.0f, curFreeMem/1000.0f];

}

@end

Swift代码：

#import "mach/mach.h"

vm_size_t usedMemory(void) {
struct task_basic_info info;
mach_msg_type_number_t size = sizeof(info);
kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &size);
return (kerr == KERN_SUCCESS) ? info.resident_size : 0; // size in bytes
}

vm_size_t freeMemory(void) {
mach_port_t host_port = mach_host_self();
mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
vm_size_t pagesize;
vm_statistics_data_t vm_stat;

host_page_size(host_port, &pagesize);
(void) host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size);
return vm_stat.free_count * pagesize;
}

void logMemUsage(void) {
// compute memory usage and log if different by >= 100k
static long prevMemUsage = 0;
long curMemUsage = usedMemory();
long memUsageDiff = curMemUsage - prevMemUsage;

if (memUsageDiff > 100000 || memUsageDiff < -100000) {
prevMemUsage = curMemUsage;
NSLog(@"Memory used %7.1f (%+5.0f), free %7.1f kb", curMemUsage/1000.0f, memUsageDiff/1000.0f, freeMemory()/1000.0f);
}
}

参考资料：1.http://blog.csdn.net/jasonblog/article/details/17685767

2.http://stackoverflow.com/questions/7989864/watching-memory-usage-in-ios/7990532#7990532