关于触屏事件的一些操作

来源：互联网发布：sizeof结构体数组编辑：程序博客网时间：2024/06/16 03:09

//需要在你的ViewController里重写几个方法：
//开始触摸的方法
- (void)touchesBegan:(NSSet *)touches
withEvent:(UIEvent *)event
{
messageLabel.text = @”Touches Began”;
[self updateLabelsFromTouches:touches];
}
//触摸取消的方法
- (void)touchesCancelled:(NSSet *)touches
withEvent:(UIEvent *)event
{
messageLabel.text = @”Touches Cancelled”;
[self updateLabelsFromTouches:touches];
}
//触摸结束的方法
- (void)touchesEnded:(NSSet *)touches
withEvent:(UIEvent *)event
{
messageLabel.text = @”Touches Stopped.”;
[self updateLabelsFromTouches:touches];
}
//触摸移动的方法
- (void)touchesMoved:(NSSet *)touches
withEvent:(UIEvent *)event
{
messageLabel.text = @”Drag Detected”;
[self updateLabelsFromTouches:touches];
}
//触摸－清扫：
//开始触摸
- (void)touchesBegan:(NSSet *)touches
withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
gestureStartPoint = [touch locationInView:self.view];
}
//kMinimumGestureLength 最小移动长度 kMaximumVariance最大偏移长度
- (void)touchesMoved:(NSSet *)touches
withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touchlocationInView:self.view];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
if(deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance)
{
label.text = @”Horizontal swipe detected”;
[self performSelector:@selector(eraseText)
withObject:nilafterDelay:2];
}
else if (deltaY >= kMinimumGestureLength &&
deltaX <= kMaximumVariance)
{
label.text = @”Vertical swipe detected”;
[selfperformSelector:@selector(eraseText)withObject:nilafterDelay:2];
}
}
//多次轻击判断，比如双击，三击等：
//单击动作响应事件
- (void)singleTap
{
singleLabel.text = @”Single Tap Detected”;
[selfperformSelector:@selector(eraseMe:)
withObject:singleLabel
afterDelay:1.6f];//1.6秒后执行eraseMe方法
}
//双击
- (void)doubleTap
{
doubleLabel.text = @”Double Tap Detected”;
[selfperformSelector:@selector(eraseMe:)
withObject:doubleLabel
afterDelay:1.6f];
}
//三击
- (void)tripleTap
{
tripleLabel.text = @”Triple Tap Detected”;
[selfperformSelector:@selector(eraseMe:)
withObject:tripleLabel
afterDelay:1.6f];
}
//四击
- (void)quadrupleTap
{
quadrupleLabel.text = @”Quadruple Tap Detected”;
[selfperformSelector:@selector(eraseMe:)
withObject:quadrupleLabel
afterDelay:1.6f];
}
- (void)eraseMe:(UITextField *)textField
{
textField.text = @"";
}
- (void)touchesBegan:(NSSet *)touches
withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject]; //实例一个uitouch
NSUInteger tapCount = [touch tapCount]; //计算touch的tapCount次数
switch (tapCount)
{
case 1:
[selfsingleTap];
break;
case 2:
[selfdoubleTap];
break;
case 3:
[selftripleTap];
break;
case 4:
[selfquadrupleTap];
break;
default:
break;
}
}
//[self performSelector:@selector(eraseMe:)withObject:singleLabel afterDelay:1.6f]中
//performSelector:@selector(eraseMe:)withObject:singleLabel afterDelay:1.6f方法为将来afterDelay1.6秒之后调用eraseMe方法
//同样的[NSObect cancelPreviousPerformSelector:withObject :afterDelay:];
//方法为取消这些将来的调用
//捏合操作：
- (void)eraseLabel
{ //清空lable
label.text = @"";
}
//开始触碰
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if([touches count] ==2)
{ //检测是否为两个手指触点
NSArray *twoTouches = [touchesallObjects];
UITouch *first = [twoTouchesobjectAtIndex:0];
UITouch *second = [twoTouchesobjectAtIndex:1];
initialDistance = distanceBetweenPoints(
[first locationInView:self.view], [secondlocationInView:self.view]);
}
}
//移动手指
- (void)touchesMoved:(NSSet *)touches
withEvent:(UIEvent *)event
{
if ([touches count] == 2)
{
NSArray *twoTouches = [touchesallObjects];
UITouch *first = [twoTouchesobjectAtIndex:0];
UITouch *second = [twoTouchesobjectAtIndex:1];
CGFloat currentDistance =distanceBetweenPoints(
[first locationInView:self.view],[secondlocationInView:self.view]);
if (initialDistance ==0)
{
initialDistance = currentDistance;//根据移动前后的坐标距离差检测是捏合的手势还是打开的手势
}
else if (currentDistance - initialDistance > kMinimumPinchDelta)
{ //检测是否大于最小移动值kMinimumPinchDelta
label.text = @”Outward Pinch”;
[selfperformSelector:@selector(eraseLabel)
withObject:nil
afterDelay:1.6f];
}
else if (initialDistance - currentDistance > kMinimumPinchDelta)
{
label.text = @”Inward Pinch”;
[selfperformSelector:@selector(eraseLabel)
withObject:nil
afterDelay:1.6f];
}
}
}
//触碰结束
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
initialDistance = 0;
}
//自定义手势“√”：
- (void)eraseLabel
{
label.text = @"";
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
lastPreviousPoint = point;
lastCurrentPoint = point;
lineLengthSoFar = 0.0f;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint previousPoint = [touchpreviousLocationInView:self.view];
CGPoint currentPoint = [touch locationInView:self.view];
//计算两条线之间的角度
CGFloat angle = angleBetweenLines(lastPreviousPoint,
lastCurrentPoint,previousPoint,currentPoint);
//检测手势被承认的条件 kMinimumCheckMarkAngle最小角度
//kMaximumCheckMarkAngle最大角度
//kMinimumCheckMarkLength画线最小长度
if (angle >= kMinimumCheckMarkAngle &&
angle <= kMaximumCheckMarkAngle &&
lineLengthSoFar > kMinimumCheckMarkLength)
{
label.text = @”Checkmark”;
[selfperformSelector:@selector(eraseLabel)
withObject:nil
afterDelay:1.6];
}
//lineLengthSoFar,lastPreviousPoint,lastCurrentPoint重新赋值
lineLengthSoFar += distanceBetweenPoints(previousPoint, currentPoint);
lastPreviousPoint = previousPoint;
lastCurrentPoint = currentPoint;
}
//这里用到一个判断两条直线的角度的方法
//angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPointlin2End);

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