ios - 以 uiscrollview 的负方式添加 View 并更改内容大小

Question

我有一个 UIScrollView，里面有一个 calendarView。我现在想要的是，接下来的 2 个月份和之前的 2 个月份已经加载到 ScrollView 中。

我有以下两种方法。

-(void)addCalendarToEnd{
    iPhoneMonthView *phoneCal =  [[iPhoneMonthView alloc] init];
    phoneCal.delegate = self;
    phoneCal.dataSource = self;
    [phoneCal selectDate:[self sameDateByAddingMonths:1 andDate:scrollDate]];
    float xValue = phoneCal.frame.size.width * numberOfCalendarsAfterToday;
    phoneCal.frame = CGRectMake(xValue, 0, phoneCal.frame.size.width, phoneCal.frame.size.height);
    [self.calendarScroll addSubview:phoneCal];
    int numberScroll = numberOfCalendarsBeforeToday + numberOfCalendarsAfterToday + 1;
    calendarScroll.contentSize = CGSizeMake(numberScroll*phoneCal.bounds.size.width,calendarScroll.bounds.size.height);
    [calendarScroll addSubview:phoneCal];
    NSLog(@"CONTENT SIZE IS %f",calendarScroll.contentSize.width);

    numberOfCalendarsAfterToday++;

}
-(void)addCalenderToBeginning{
    iPhoneMonthView *phoneCal =  [[iPhoneMonthView alloc] init];
    phoneCal.delegate = self;
    phoneCal.dataSource = self;
    [phoneCal selectDate:[self sameDateByAddingMonths:-1 andDate:scrollDate]];
    float xValue = phoneCal.frame.size.width * numberOfCalendarsBeforeToday;
    NSLog(@"XVALUE IS %f",xValue);
    phoneCal.frame = CGRectMake(-xValue, 0, phoneCal.frame.size.width, phoneCal.frame.size.height);
    [self.calendarScroll addSubview:phoneCal];
    int numberScroll = numberOfCalendarsBeforeToday + numberOfCalendarsAfterToday + 1;
    calendarScroll.contentSize = CGSizeMake(numberScroll*phoneCal.bounds.size.width,calendarScroll.bounds.size.height);
    NSLog(@"CONTENT SIZE IS %f",calendarScroll.contentSize.width);
    numberOfCalendarsBeforeToday++;
}

addCalendarToEnd 正常工作。但是 addCalendarToBeginning 不是。 它在正确的位置添加 View 。但是我不知道应该如何设置 UIScrollView 的 contentSize。

谁能帮帮我？

编辑

这就是我在 ViewDidLoad 中所做的

 scrollDate = [NSDate new];    
    iPhoneMonthView *phoneCal =  [[iPhoneMonthView alloc] init];
    phoneCal.frame = CGRectMake(0, 0, phoneCal.frame.size.width, phoneCal.frame.size.height);
    phoneCal.delegate = self;
    phoneCal.dataSource = self;
    [phoneCal selectDate:[NSDate new]];
    NSLog(@"PHONE CALL HEIGHT IS %f",phoneCal.frame.size.height);
    float xValue = phoneCal.frame.size.width * numberOfCalendarsAfterToday;
    phoneCal.frame = CGRectMake(xValue, 0, phoneCal.frame.size.width, phoneCal.frame.size.height);


    calendarScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, phoneCal.frame.size.width, phoneCal.frame.size.height)];
    calendarScroll.delegate = self;
    [calendarScroll addSubview:phoneCal];
    calendarScroll.backgroundColor = [UIColor clearColor];
    calendarScroll.contentSize =CGSizeMake(numberOfCalendarsAfterToday*phoneCal.frame.size.width,phoneCal.frame.size.height);
    calendarScroll.contentOffset = CGPointZero;

    [self.calendarView addSubview:calendarScroll];
    NSLog(@"PHONE CALL HEIGHT NOW IS %f",phoneCal.frame.size.height);


    numberOfCalendarsBeforeToday++;
    numberOfCalendarsAfterToday++;

Answer 1

如果您只想滚动 5 个月，那么我建议以线性方式填充内容，然后适当移动内容偏移量。

因此遍历 View ，将它们添加到 ScrollView 并调整框架的原点，使它们彼此齐平。

然后调整contentOffset这样

scrollview.contentOffset.x = 3*phoneCal.frame.size.width;

然而，如果你想滚动查看“无限”数量，你应该看看像 DMCircularScrollView 这样的解决方案。