iphone - UIScrollView触摸和监听事件

我在UIScrollView中有一个图像，并且我有一些代码，可在用户拖动手指时绘制文本。我希望能够控制用户何时触摸屏幕，如果

a）用户应使用手指画图或

b）用户应该用手指四处移动滚动视图

我有一个布尔值，它跟踪用户在做什么。我有接触方法：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
    if(draw == false) {
        printf("calling super");
        [scrollView touchesBegan:touches withEvent:event];
    }
    else
        [myPath moveToPoint:[mytouch locationInView:self]];

}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
    if(draw == false)
        [scrollView touchesMoved:touches withEvent:event];
    else {
        [myPath addLineToPoint:[mytouch locationInView:self]];
        [self setNeedsDisplay];
    }

为什么不起作用？基本上，如果我不绘图，则调用滚动视图的touchesBegan和touchesMoved。如果要绘图，则使用myPath进行绘图。

但是，当draw为false时，滚动视图不会像应有的那样移动或放大。

最佳答案

我以前遇到过这个问题。我这样解决：

您应该制作一个mainView。它有2个属性。一个是yourScrollView，一个是yourDrawImageView。 [yourScrollView addSubviews:yourDrawImageView];[mainView addSubviews:yourScrollView];

然后像这样在mainView.m中编写touches方法（忽略scrollView语句）

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
   if ([[touches allObjects] isKindOfClass:[yourDrawImageView class]])
   {

        [myPath moveToPoint:[mytouch locationInView:self]];
   }

}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
   if ([[touches allObjects] isKindOfClass:[yourDrawImageView class]])
   {

        [myPath addLineToPoint:[mytouch locationInView:self]];
        [self setNeedsDisplay];
   }


}

最后一步，在yourSceollView.m中写什么s you ignor is to code scrollView touches event , it，如下所示：

#import "yourScrollView.h"


@implementation yourScrollView


- (id)initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code.
    }
    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesBegan:touches withEvent:event];
    if(!self.dragging)
        [[self nextResponder] touchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesMoved:touches withEvent:event];
    if(!self.dragging)
        [[self nextResponder] touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesEnded:touches withEvent:event];
    if(!self.dragging)
        [[self nextResponder] touchesEnded:touches withEvent:event];
}

- (void)dealloc {
    [super dealloc];
}


@end

希望它可以对您有所帮助:-)

关于iphone - UIScrollView触摸和监听事件，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11694208/