-4
我使用这个类来创建一个圆形滑块，但我有一个问题，当用户从1％滑动到100％反之亦然？请帮我解决这个问题。提前致谢。不允许从1％滑到100％，反之亦然在圆滑块iOS
这里是代码：
@interface SLCircularSlider()
@property (nonatomic) CGPoint thumbCenterPoint;
#pragma mark - Init and Setup methods
- (void)setup;
#pragma mark - Thumb management methods
- (BOOL)isPointInThumb:(CGPoint)point;
#pragma mark - Drawing methods
- (CGFloat)sliderRadius;
- (void)drawThumbAtPoint:(CGPoint)sliderButtonCenterPoint inContext:(CGContextRef)context;
- (CGPoint)drawCircularTrack:(float)track atPoint:(CGPoint)point withRadius:(CGFloat)radius inContext:(CGContextRef)context;
- (CGPoint)drawPieTrack:(float)track atPoint:(CGPoint)point withRadius:(CGFloat)radius inContext:(CGContextRef)context;
@end
#pragma mark -
@implementation SLCircularSlider
@synthesize value = _value;
- (void)setValue:(float)value {
if (value != _value) {
if (value > self.maximumValue) { value = self.maximumValue; }
if (value < self.minimumValue) { value = self.minimumValue; }
_value = value;
[self setNeedsDisplay];
if (self.isContinuous) {
[self sendActionsForControlEvents:UIControlEventValueChanged];
}
}
}
@synthesize minimumValue = _minimumValue;
- (void)setMinimumValue:(float)minimumValue {
if (minimumValue != _minimumValue) {
_minimumValue = minimumValue;
if (self.maximumValue < self.minimumValue) { self.maximumValue = self.minimumValue; }
if (self.value < self.minimumValue) { self.value = self.minimumValue; }
}
}
@synthesize maximumValue = _maximumValue;
- (void)setMaximumValue:(float)maximumValue {
if (maximumValue != _maximumValue) {
_maximumValue = maximumValue;
if (self.minimumValue > self.maximumValue) { self.minimumValue = self.maximumValue; }
if (self.value > self.maximumValue) { self.value = self.maximumValue; }
}
}
@synthesize minimumTrackTintColor = _minimumTrackTintColor;
- (void)setMinimumTrackTintColor:(UIColor *)minimumTrackTintColor {
if (![minimumTrackTintColor isEqual:_minimumTrackTintColor]) {
_minimumTrackTintColor = minimumTrackTintColor;
[self setNeedsDisplay];
}
}
@synthesize maximumTrackTintColor = _maximumTrackTintColor;
- (void)setMaximumTrackTintColor:(UIColor *)maximumTrackTintColor {
if (![maximumTrackTintColor isEqual:_maximumTrackTintColor]) {
_maximumTrackTintColor = maximumTrackTintColor;
[self setNeedsDisplay];
}
}
@synthesize thumbTintColor = _thumbTintColor;
- (void)setThumbTintColor:(UIColor *)thumbTintColor {
if (![thumbTintColor isEqual:_thumbTintColor]) {
_thumbTintColor = thumbTintColor;
[self setNeedsDisplay];
}
}
@synthesize continuous = _continuous;
@synthesize sliderStyle = _sliderStyle;
- (void)setSliderStyle:(UICircularSliderStyle)sliderStyle {
if (sliderStyle != _sliderStyle) {
_sliderStyle = sliderStyle;
[self setNeedsDisplay];
}
}
@synthesize thumbCenterPoint = _thumbCenterPoint;
/** @name Init and Setup methods */
#pragma mark - Init and Setup methods
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self setup];
}
return self;
}
- (void)awakeFromNib {
[self setup];
}
- (void)setup {
self.value = 0.0;
self.minimumValue = 0.0;
self.maximumValue = 1.0;
/*self.minimumTrackTintColor = [UIColor blueColor];
self.maximumTrackTintColor = [UIColor whiteColor];
self.thumbTintColor = [UIColor darkGrayColor];*/
self.minimumTrackTintColor = [UIColor clearColor];
self.maximumTrackTintColor = [UIColor clearColor];
self.thumbTintColor = [UIColor clearColor];
self.continuous = YES;
self.thumbCenterPoint = CGPointZero;
/**
* This tapGesture isn't used yet but will allow to jump to a specific location in the circle
*/
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureHappened:)];
[self addGestureRecognizer:tapGestureRecognizer];
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureHappened:)];
panGestureRecognizer.maximumNumberOfTouches = panGestureRecognizer.minimumNumberOfTouches;
[self addGestureRecognizer:panGestureRecognizer];
}
/** @name Drawing methods */
#pragma mark - Drawing methods
#define kLineWidth 5.0
#define kThumbRadius 12.0
- (CGFloat)sliderRadius {
CGFloat radius = MIN(self.bounds.size.width/2, self.bounds.size.height/2);
radius -= MAX(kLineWidth, kThumbRadius);
return radius;
}
- (void)drawThumbAtPoint:(CGPoint)sliderButtonCenterPoint inContext:(CGContextRef)context {
UIGraphicsPushContext(context);
CGContextBeginPath(context);
CGContextMoveToPoint(context, sliderButtonCenterPoint.x, sliderButtonCenterPoint.y);
CGContextAddArc(context, sliderButtonCenterPoint.x, sliderButtonCenterPoint.y, kThumbRadius, 0.0, 2*M_PI, NO);
CGContextFillPath(context);
UIGraphicsPopContext();
}
- (CGPoint)drawCircularTrack:(float)track atPoint:(CGPoint)center withRadius:(CGFloat)radius inContext:(CGContextRef)context {
UIGraphicsPushContext(context);
CGContextBeginPath(context);
float angleFromTrack = translateValueFromSourceIntervalToDestinationInterval(track, self.minimumValue, self.maximumValue, 0, 2*M_PI);
CGFloat startAngle = -M_PI_2;
CGFloat endAngle = startAngle + angleFromTrack;
CGContextAddArc(context, center.x, center.y, radius, startAngle, endAngle, NO);
CGPoint arcEndPoint = CGContextGetPathCurrentPoint(context);
CGContextStrokePath(context);
UIGraphicsPopContext();
return arcEndPoint;
}
- (CGPoint)drawPieTrack:(float)track atPoint:(CGPoint)center withRadius:(CGFloat)radius inContext:(CGContextRef)context {
UIGraphicsPushContext(context);
float angleFromTrack = translateValueFromSourceIntervalToDestinationInterval(track, self.minimumValue, self.maximumValue, 0, 2*M_PI);
CGFloat startAngle = -M_PI_2;
CGFloat endAngle = startAngle + angleFromTrack;
CGContextMoveToPoint(context, center.x, center.y);
CGContextAddArc(context, center.x, center.y, radius, startAngle, endAngle, NO);
CGPoint arcEndPoint = CGContextGetPathCurrentPoint(context);
CGContextClosePath(context);
CGContextFillPath(context);
UIGraphicsPopContext();
return arcEndPoint;
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGPoint middlePoint;
middlePoint.x = self.bounds.origin.x + self.bounds.size.width/2;
middlePoint.y = self.bounds.origin.y + self.bounds.size.height/2;
CGContextSetLineWidth(context, kLineWidth);
CGFloat radius = [self sliderRadius];
switch (self.sliderStyle) {
case UICircularSliderStylePie:
[self.maximumTrackTintColor setFill];
[self drawPieTrack:self.maximumValue atPoint:middlePoint withRadius:radius inContext:context];
[self.minimumTrackTintColor setStroke];
[self drawCircularTrack:self.maximumValue atPoint:middlePoint withRadius:radius inContext:context];
[self.minimumTrackTintColor setFill];
self.thumbCenterPoint = [self drawPieTrack:self.value atPoint:middlePoint withRadius:radius inContext:context];
break;
case UICircularSliderStyleCircle:
default:
[self.maximumTrackTintColor setStroke];
[self drawCircularTrack:self.maximumValue atPoint:middlePoint withRadius:radius inContext:context];
[self.minimumTrackTintColor setStroke];
self.thumbCenterPoint = [self drawCircularTrack:self.value atPoint:middlePoint withRadius:radius inContext:context];
break;
}
[self.thumbTintColor setFill];
[self drawThumbAtPoint:self.thumbCenterPoint inContext:context];
}
/** @name Thumb management methods */
#pragma mark - Thumb management methods
- (BOOL)isPointInThumb:(CGPoint)point {
CGRect thumbTouchRect = CGRectMake(self.thumbCenterPoint.x - kThumbRadius, self.thumbCenterPoint.y - kThumbRadius, kThumbRadius*2, kThumbRadius*2);
return CGRectContainsPoint(thumbTouchRect, point);
}
/** @name UIGestureRecognizer management methods */
#pragma mark - UIGestureRecognizer management methods
- (void)panGestureHappened:(UIPanGestureRecognizer *)panGestureRecognizer {
CGPoint tapLocation = [panGestureRecognizer locationInView:self];
/* UILabel* percentlbl =(UILabel*) [self.superview viewWithTag:10];
NSLog(@"percentlbl frame %f",percentlbl.frame.origin.y
);
if (CGRectContainsPoint(percentlbl.frame, tapLocation)) {
NSLog(@"Tapped label");
}*/
switch (panGestureRecognizer.state) {
case UIGestureRecognizerStateChanged: {
CGFloat radius = [self sliderRadius];
CGPoint sliderCenter = CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2);
CGPoint sliderStartPoint = CGPointMake(sliderCenter.x, sliderCenter.y - radius);
CGFloat angle = angleBetweenThreePoints(sliderCenter, sliderStartPoint, tapLocation);
if (angle < 0) {
angle = -angle;
}
else {
angle = 2*M_PI - angle;
}
self.value = translateValueFromSourceIntervalToDestinationInterval(angle, 0, 2*M_PI, self.minimumValue, self.maximumValue);
break;
}
case UIGestureRecognizerStateEnded:
if (!self.isContinuous) {
[self sendActionsForControlEvents:UIControlEventValueChanged];
}
if ([self isPointInThumb:tapLocation]) {
[self sendActionsForControlEvents:UIControlEventTouchUpInside];
}
else {
[self sendActionsForControlEvents:UIControlEventTouchUpOutside];
}
break;
default:
break;
}
}
- (void)tapGestureHappened:(UITapGestureRecognizer *)tapGestureRecognizer {
if (tapGestureRecognizer.state == UIGestureRecognizerStateEnded) {
CGPoint tapLocation = [tapGestureRecognizer locationInView:self];
if ([self isPointInThumb:tapLocation]) {
}
else {
}
}
}
/** @name Touches Methods */
#pragma mark - Touches Methods
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInView:self];
if ([self isPointInThumb:touchLocation]) {
[self sendActionsForControlEvents:UIControlEventTouchDown];
}
}
@end
/** @name Utility Functions */
#pragma mark - Utility Functions
float translateValueFromSourceIntervalToDestinationInterval(float sourceValue, float sourceIntervalMinimum, float sourceIntervalMaximum, float destinationIntervalMinimum, float destinationIntervalMaximum) {
float a, b, destinationValue;
a = (destinationIntervalMaximum - destinationIntervalMinimum)/(sourceIntervalMaximum - sourceIntervalMinimum);
b = destinationIntervalMaximum - a*sourceIntervalMaximum;
destinationValue = a*sourceValue + b;
return destinationValue;
}
CGFloat angleBetweenThreePoints(CGPoint centerPoint, CGPoint p1, CGPoint p2) {
CGPoint v1 = CGPointMake(p1.x - centerPoint.x, p1.y - centerPoint.y);
CGPoint v2 = CGPointMake(p2.x - centerPoint.x, p2.y - centerPoint.y);
CGFloat angle = atan2f(v2.x*v1.y - v1.x*v2.y, v1.x*v2.x + v1.y*v2.y);
return angle;
}
这是'@ synthesize'的奇怪用法。 – zaph