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我試圖瞭解這段代碼是如何導致內存泄漏，我很難。從我一直在讀的內容來看，ARC不管理CF對象，我必須釋放它們。我試過這樣做，但根據Apple的儀器工具仍然有泄漏。任何意見將不勝感激...提前致謝內存泄漏與IOPSCopyPowerSourcesInfo（）
- (void) getPowerInfo : (id) sender {
CFTypeRef blob = IOPSCopyPowerSourcesInfo();
CFArrayRef sources = IOPSCopyPowerSourcesList(blob);
CFDictionaryRef pSource = NULL;
const void *psValue;
// if there is no power source
if (CFArrayGetCount(sources) == 0) {
NSLog(@"Number of power sources found: 0; Aborting battery monitoring");
} else { // if there is a power source
// for each power source
for (int i = 0 ; i < CFArrayGetCount(sources) ; i++) {
pSource = IOPSGetPowerSourceDescription(blob, CFArrayGetValueAtIndex(sources, i));
NSString *currentPowerState = CFDictionaryGetValue (pSource, CFSTR (kIOPSPowerSourceStateKey));
if (!pSource) { // if source is nil
NSLog(@"Power source is nil");
} else if ([currentPowerState isEqualToString:@"AC Power"]) { // if source is adapter
NSLog(@"Mac is plugged in.");
} else { // if source is battery
psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));
int curCapacity = 0;
int maxCapacity = 0;
int percent;
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);
percent = (int)((double)curCapacity/(double)maxCapacity * 100);
if (!percent) {
NSLog(@"Battery %% is nil");
} else {
NSLog(@"Battery %% is %i", percent);
}
CFRelease(psValue);
}
}
}
CFRelease(sources);
CFRelease(pSource); }