Question

我正在努力弄清楚这段代码有什么问题。我想我不太了解引用计数。在iOS版本中我总是依赖ARC。但我应该快速升级到4.0到7.0编写的代码。运行分析会显示以下错误：

Method返回一个带有+0保留计数的Objective-C对象＆安培;引用计数递增。

该对象现在在行:[self changeSelectionTo:[[gregorian dateFromComponents:currentComps] retain]];

处有+1保留计数

对象泄露：此执行路径中未引用已分配的对象，并且[currentPageView selectDate:selected];处的保留计数为+1

我是IOS的新手，我似乎无法识别此代码中的问题。非常感谢您的帮助。

@property (nonatomic, retain) id<CalendarViewDelegate> delegate;
@property (nonatomic, readonly) NSDate *selected;

- (id)initWithDelegate:(id<CalendarViewDelegate>)d {
if (self = [super initWithFrame:CGRectMake(0, 0, 320, 480)]) {
    delegate = [d retain];

    self.backgroundColor = [UIColor whiteColor];

    gregorian = [[NSCalendar alloc]
                 initWithCalendarIdentifier:NSGregorianCalendar];

    [self createUIControls];

    NSDateComponents *currentComps =
    [gregorian components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:[NSDate date]];

    currentDay = currentComps.day;
    currentMonth = currentComps.month;
    currentYear = currentComps.year;

    showingMonth = currentComps.month;
    showingYear = currentComps.year;

    [self updateLastAndNextMonthAttributes];

    [self updateMonthHeader];

    currentPageView = [[CalendarPageView alloc] initWithMonth:showingMonth
                                                      andYear:showingYear delegate:self];
    currentPageView.frame = CGRectMake(0, 0, currentPageView.bounds.size.width, currentPageView.bounds.size.height);
    currentPageView.delegate = self;
    [pagesView addSubview:currentPageView];

// the memory leak issue seems to be in this area
    [self changeSelectionTo:[[gregorian dateFromComponents:currentComps] retain]];

    [currentPageView selectDate:selected];
    highlighted = nil;

内存泄漏iOS 5.0之前。

0 个答案: