UIScrollView的contentOffset

Question

我如何获得contentOffset的x位置？

这是我的代码，但在日志中总是抛出

- (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CGPoint，它由CGFloats组成。将％i设为％f。

Answer 2

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

或定义如下

CGFloat offSet= scrollview.contentOffset.x;

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