Question

我有这个代码用于增加图像的高度。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [[event allTouches] anyObject];
    touchStart = [[touches anyObject] locationInView:self.image];
    touchStart2 = [[touches anyObject] locationInView:self.tableView];
    isResizingLR = ( self.image.bounds.size.height - touchStart.y < kResizeThumbSize );
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    CGPoint touchPoint = [[touches anyObject] locationInView:self.image];
    CGPoint previous=[[touches anyObject]previousLocationInView:self.image];

    float  deltaWidth = touchPoint.x-previous.x;
    float  deltaHeight = touchPoint.y-previous.y;


    if (isResizingLR) {

        self.image.frame = CGRectMake(self.image.frame.origin.x, self.image.frame.origin.y, self.image.frame.size.width, touchPoint.y + deltaWidth);
        self.tableView.frame = CGRectMake(self.tableView.frame.origin.x ,self.tableView.frame.origin.y + deltaHeight,  self.tableView.frame.size.width, self.tableView.frame.size.height - deltaHeight );
        self.viewTitle.frame = CGRectMake(self.viewTitle.frame.origin.x ,self.viewTitle.frame.origin.y + deltaHeight,  self.viewTitle.frame.size.width, self.viewTitle.frame.size.height);
    }
}

我想为minimHeight = 100和maximHeight = 300设置条件; 我怎样才能做到这一点？我已经尝试过了：

if (isResizingLR) {

        if (self.image.frame.size.height >100 && self.image.frame.size.height <300) {
        self.image.frame = CGRectMake(self.image.frame.origin.x, self.image.frame.origin.y, self.image.frame.size.width, touchPoint.y + deltaWidth);
        self.tableView.frame = CGRectMake(self.tableView.frame.origin.x ,self.tableView.frame.origin.y + deltaHeight,  self.tableView.frame.size.width, self.tableView.frame.size.height - deltaHeight );
        self.viewTitle.frame = CGRectMake(self.viewTitle.frame.origin.x ,self.viewTitle.frame.origin.y + deltaHeight,  self.viewTitle.frame.size.width, self.viewTitle.frame.size.height);
        }
    }

但每次拖动图像后：self.image.frame.size.height = 100或300，我无法调整图像大小。他需要一直拖延！谢谢！

编辑：我不想在heightImage为100时调整大小。

我的原始图像高度为200.我的用户可以点击并调整图像大小，但不超过300且小于100.我只需要设置最小和最大高度。我希望你现在明白。

Answer 1

您是否尝试过测试<=和>=？

if (self.image.frame.size.height >= 100 && self.image.frame.size.height <= 300) {
    //...
}

Answer 2

我解决了这个问题。

int aux=touchPoint.y + deltaWidth;
if (aux>300) {
            aux=300;
        }
        else if(aux<100){
            aux=100;
        }
 self.image.frame = CGRectMake(self.image.frame.origin.x, self.image.frame.origin.y, self.image.frame.size.width, aux);

如何用最小值和最大值拖动图像？

2 个答案: