-
触屏事件
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-
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- - (void)touchesBegan:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- messageLabel.text = @”Touches Began”;
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- [self updateLabelsFromTouches:touches];
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- }
-
-
- - (void)touchesCancelled:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- messageLabel.text = @”Touches Cancelled”;
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- [self updateLabelsFromTouches:touches];
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- }
-
-
- - (void)touchesEnded:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- messageLabel.text = @”Touches Stopped.”;
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- [self updateLabelsFromTouches:touches];
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- }
-
-
- - (void)touchesMoved:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- messageLabel.text = @”Drag Detected”;
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- [self updateLabelsFromTouches:touches];
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- }
-
-
-
- - (void)touchesBegan:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- UITouch *touch = [touches anyObject];
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- gestureStartPoint = [touch locationInView:self.view];
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- }
-
-
- - (void)touchesMoved:(NSSet *)touches
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- withEvent:(UIEvent *)event
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- {
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- UITouch *touch = [touches anyObject];
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- CGPoint currentPosition = [touchlocationInView:self.view];
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- CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
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- CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
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- if(deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance)
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- {
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- label.text = @”Horizontal swipe detected”;
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- [self performSelector:@selector(eraseText)
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- withObject:nilafterDelay:2];
-
- }
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- else if (deltaY >= kMinimumGestureLength &&
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- deltaX <= kMaximumVariance)
-
- {
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- label.text = @”Vertical swipe detected”;
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- [selfperformSelector:@selector(eraseText)withObject:nilafterDelay:2];
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- }
-
- }
-
-
-
- - (void)singleTap
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- {
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- singleLabel.text = @”Single Tap Detected”;
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- [selfperformSelector:@selector(eraseMe:)
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- withObject:singleLabel
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- afterDelay:1.6f];
-
- }
-
-
- - (void)doubleTap
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- {
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- doubleLabel.text = @”Double Tap Detected”;
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- [selfperformSelector:@selector(eraseMe:)
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- withObject:doubleLabel
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- afterDelay:1.6f];
-
- }
-
-
- - (void)tripleTap
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- {
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- tripleLabel.text = @”Triple Tap Detected”;
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- [selfperformSelector:@selector(eraseMe:)
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- withObject:tripleLabel
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- afterDelay:1.6f];
-
- }
-
-
- - (void)quadrupleTap
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- {
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- quadrupleLabel.text = @”Quadruple Tap Detected”;
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- [selfperformSelector:@selector(eraseMe:)
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- withObject:quadrupleLabel
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- afterDelay:1.6f];
-
- }
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- - (void)eraseMe:(UITextField *)textField
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- {
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- textField.text = @"";
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- }
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- - (void)touchesBegan:(NSSet *)touches
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- withEvent:(UIEvent *)event
-
- {
-
- UITouch *touch = [touches anyObject];
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- NSUInteger tapCount = [touch tapCount];
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- switch (tapCount)
-
- {
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- case 1:
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- [selfsingleTap];
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- break;
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- case 2:
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- [selfdoubleTap];
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- break;
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- case 3:
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- [selftripleTap];
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- break;
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- case 4:
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- [selfquadrupleTap];
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- break;
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- default:
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- break;
-
- }
-
- }
-
-
-
-
-
-
- - (void)eraseLabel
-
- {
-
- label.text = @"";
-
- }
-
-
- - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
-
- {
-
- if([touches count] ==2)
-
- {
-
- NSArray *twoTouches = [touchesallObjects];
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- UITouch *first = [twoTouchesobjectAtIndex:0];
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- UITouch *second = [twoTouchesobjectAtIndex:1];
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- initialDistance = distanceBetweenPoints(
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- [first locationInView:self.view], [secondlocationInView:self.view]);
-
- }
-
- }
-
-
- - (void)touchesMoved:(NSSet *)touches
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- 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;
-
- }
-
- else if (currentDistance - initialDistance > 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];
-
- }
-
- }
-
- }
-
-
- - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
-
- {
-
- initialDistance = 0;
-
- }
-
-
- - (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];
-
-
- CGFloat angle = angleBetweenLines(lastPreviousPoint,
-
- lastCurrentPoint,previousPoint,currentPoint);
-
-
-
-
- if (angle >= kMinimumCheckMarkAngle &&
-
- angle <= kMaximumCheckMarkAngle &&
-
- lineLengthSoFar > kMinimumCheckMarkLength)
-
- {
-
- label.text = @”Checkmark”;
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- [selfperformSelector:@selector(eraseLabel)
-
- withObject:nil
-
- afterDelay:1.6];
-
- }
-
-
- lineLengthSoFar += distanceBetweenPoints(previousPoint, currentPoint);
-
- lastPreviousPoint = previousPoint;
-
- lastCurrentPoint = currentPoint;
-
- }
-
-
-
-
-
- #import <CoreGraphics/CoreGraphics.h>
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- CGFloat distanceBetweenPoints (CGPoint first,CGPoint second);
-
- CGFloat angleBetweenPoints(CGPoint first, CGPoint second);
-
- CGFloat angleBetweenLines(CGPoint line1Start,CGPoint line1End, CGPoint line2Start,CGPoint lin2End);
-
-
- #include ”CGPointUtils.h”
-
- #include <math.h>
-
- #define pi 3.14159265358979323846
-
- #define degreesToRadian(x) (pi * x / 180.0)
-
- #define radiansToDegrees(x) (180.0 * x / pi)
-
- CGFloat distanceBetweenPoints (CGPoint first,CGPoint second)
-
- {
-
- CGFloat deltaX = second.x - first.x;
-
- CGFloat deltaY = second.y - first.y;
-
- return sqrt(deltaX*deltaX + deltaY*deltaY );
-
- };
-
- CGFloat angleBetweenPoints(CGPoint first, CGPoint second)
-
- {
-
- CGFloat height = second.y - first.y;
-
- CGFloat width = first.x - second.x;
-
- CGFloat rads = atan(height/width);
-
- returnradiansToDegrees(rads);
-
-
- }
-
- CGFloat angleBetweenLines(CGPoint line1Start,CGPoint line1End, CGPoint line2Start,CGPoint line2End)
-
- {
-
- CGFloat a = line1End.x - line1Start.x;
-
- CGFloat b = line1End.y - line1Start.y;
-
- CGFloat c = line2End.x - line2Start.x;
-
- CGFloat d = line2End.y - line2Start.y;
-
- CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
-
- returnradiansToDegrees(rads);
-
- }
-
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原文地址:https://www.cnblogs.com/W-Kr/p/5095326.html
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