#import "IOPSKeys.h"
#import "IOPowerSources.h"
-(double) getBatteryLevel{
// 返回电量信息
CFTypeRef blob = IOPSCopyPowerSourcesInfo();
// 返回电量句柄列表数据
CFArrayRef sources = IOPSCopyPowerSourcesList(blob);
CFDictionaryRef pSource = NULL;
const void *psValue;
// 返回数组大小
int numOfSources = CFArrayGetCount(sources);
// 计算大小出错处理
if (numOfSources == 0) {
NSLog(@"Error in CFArrayGetCount");
return -1.0f;
}
// 计算所剩电量
for (int i=0; i<numOfSources; i++) {
// 返回电源可读信息的字典
pSource = IOPSGetPowerSourceDescription(blob, CFArrayGetValueAtIndex(sources, i));
if (!pSource) {
NSLog(@"Error in IOPSGetPowerSourceDescription");
return -1.0f;
}
psValue = (CFStringRef) CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));
int curCapacity = 0;
int maxCapacity = 0;
double percentage;
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);
percentage = ((double) curCapacity / (double) maxCapacity * 100.0f);
NSLog(@"curCapacity : %d / maxCapacity: %d , percentage: %.1f ", curCapacity, maxCapacity, percentage);
return percentage;
}
return -1.
struct thread_basic_info {
time_value_t user_time; /* user 运行的时间 */
time_value_t system_time; /* system 运行的时间 */
integer_t cpu_usage; /* CPU 使用百分比 */
policy_t policy; /* 有效的计划策略 */
integer_t run_state; /* run state (see below) */
integer_t flags; /* various flags (see below) */
integer_t suspend_count; /* suspend count for thread */
integer_t sleep_time; /* 休眠时间 */
};
// 轮询检查多个线程 CPU 情况
+ (void)updateCPU {
thread_act_array_t threads;
mach_msg_type_number_t threadCount = 0;
const task_t thisTask = mach_task_self();
kern_return_t kr = task_threads(thisTask, &threads, &threadCount);
if (kr != KERN_SUCCESS) {
return;
}
for (int i = 0; i < threadCount; i++) {
thread_info_data_t threadInfo;
thread_basic_info_t threadBaseInfo;
mach_msg_type_number_t threadInfoCount = THREAD_INFO_MAX;
if (thread_info((thread_act_t)threads[i], THREAD_BASIC_INFO, (thread_info_t)threadInfo, &threadInfoCount) == KERN_SUCCESS) {
threadBaseInfo = (thread_basic_info_t)threadInfo;
if (!(threadBaseInfo->flags & TH_FLAGS_IDLE)) {
integer_t cpuUsage = threadBaseInfo->cpu_usage / 10;
if (cpuUsage > 90) {
//cup 消耗大于 90 时打印和记录堆栈
NSString *reStr = smStackOfThread(threads[i]);
// 记录数据库中
[[[SMLagDB shareInstance] increaseWithStackString:reStr] subscribeNext:^(id x) {}];
NSLog(@"CPU useage overload thread stack：\n%@",reStr);
}
}
}
}
}
2.对一定要在app处理的复杂计算，通过gcd的dispatch_block_create_with_qos_class方法指定队列的qos为QOS_CLASS_UTILITY,因为他对电量做了优化 -------------------优化cpu耗电问题
- (UIImage *)imageFromMemoryCacheForKey:(NSString *)key {
return [self.memCache objectForKey:key];
}
- (UIImage *)imageFromDiskCacheForKey:(NSString *)key {
// 检查 NSCache 里是否有
UIImage *image = [self imageFromMemoryCacheForKey:key];
if (image) {
return image;
}
// 从磁盘里读
UIImage *diskImage = [self diskImageForKey:key];
if (diskImage && self.shouldCacheImagesInMemory) {
NSUInteger cost = SDCacheCostForImage(diskImage);
[self.memCache setObject:diskImage forKey:key cost:cost];
}
return diskImage;
}
