UIScrollView的contentOffset

Question

如何获取contentOffset的x位置？

下面是我的代码，但它在日志中总是抛出0

- (void)adjustAreaScroll:(NSNotification *)notification
{
    int value = [[notification object] intValue];
    NSLog(@"adjustAreaScroll, %i", value);

    switch (value) {
        case 0:
            [topScroll setContentOffset:CGPointMake(0, 0)];
            break;
        case 1:
            [topScroll setContentOffset:CGPointMake(1024, 0)];
            break;
        case 2:
            [topScroll setContentOffset:CGPointMake(2048, 0)];
            break;
        case 3:
            [topScroll setContentOffset:CGPointMake(3072, 0)];
            break;
    }
    NSLog(@"target position -----> %i", self.topScroll.contentOffset.x);
}

Answer 1

CGPointMake返回一个由CGFloats组成的CGPoint。将%i转换为%f。

Answer 2

     NSLog(@"Offset : %@", NSStringFromCGPoint(scrollview.contentOffset.x));

或者像这样定义

CGFloat offSet= scrollview.contentOffset.x;

NSLog(@"Offset : %f", offset);