author | Wuzzy <Wuzzy2@mail.ru> |
Wed, 15 May 2019 04:06:47 +0200 | |
changeset 14974 | 6c17ef373079 |
parent 13166 | ba5c794adae3 |
permissions | -rwxr-xr-x |
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// |
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// MNEValueTrackingSlider |
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// |
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// Copyright 2012 Michael Neuwert |
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// "You can use the code in your own project and modify it as you like." |
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// http://blog.neuwert-media.com/2012/04/customized-uislider-with-visual-value-tracking/ |
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// |
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#import "MNEValueTrackingSlider.h" |
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#pragma mark - |
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#pragma mark Private UIView subclass rendering the popup showing slider value |
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@interface SliderValuePopupView : UIView |
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@property (nonatomic, strong) UIFont *font; |
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@property (nonatomic, copy) NSString *text; |
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@property (nonatomic) float arrowOffset; |
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@end |
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@implementation SliderValuePopupView |
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@synthesize font = _font; |
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@synthesize text = _text; |
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@synthesize arrowOffset = _arrowOffset; |
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- (id)initWithFrame:(CGRect)frame { |
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self = [super initWithFrame:frame]; |
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if (self) { |
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self.font = [UIFont boldSystemFontOfSize:18]; |
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} |
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return self; |
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} |
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- (void)drawRect:(CGRect)rect { |
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// Create the path for the rounded rectangle |
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CGRect roundedRect = CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, floorf(self.bounds.size.height * 0.8)); |
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UIBezierPath *roundedRectPath = [UIBezierPath bezierPathWithRoundedRect:roundedRect cornerRadius:6.0]; |
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roundedRectPath.lineWidth = 2.0f; |
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// Create the arrow path |
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UIBezierPath *arrowPath = [UIBezierPath bezierPath]; |
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/* |
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// Make sure the arrow offset is nice |
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if (-self.arrowOffset + 1 > CGRectGetMidX(self.bounds) / 2) |
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self.arrowOffset = -CGRectGetMidX(self.bounds) / 2 + 1; |
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if (self.arrowOffset > CGRectGetMidX(self.bounds) / 2) |
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self.arrowOffset = CGRectGetMidX(self.bounds) / 2 -1; |
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*/ |
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CGFloat midX = CGRectGetMidX(self.bounds) + self.arrowOffset; |
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CGPoint p0 = CGPointMake(midX, CGRectGetMaxY(self.bounds)); |
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[arrowPath moveToPoint:p0]; |
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[arrowPath addLineToPoint:CGPointMake((midX - 10.0), CGRectGetMaxY(roundedRect))]; |
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[arrowPath addLineToPoint:CGPointMake((midX + 10.0), CGRectGetMaxY(roundedRect))]; |
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[arrowPath closePath]; |
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// Attach the arrow path to the rounded rect |
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[roundedRectPath appendPath:arrowPath]; |
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// Color various sections |
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[[UIColor blackColor] setFill]; |
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[roundedRectPath fill]; |
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[[UIColor whiteColor] setStroke]; |
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[roundedRectPath stroke]; |
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[[UIColor whiteColor] setFill]; |
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[arrowPath fill]; |
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// Draw the text |
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if (self.text) { |
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[[UIColor lightYellowColor] set]; |
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CGSize s = [_text sizeWithFont:self.font]; |
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CGFloat yOffset = (roundedRect.size.height - s.height) / 2; |
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CGRect textRect = CGRectMake(roundedRect.origin.x, yOffset, roundedRect.size.width, s.height); |
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[_text drawInRect:textRect |
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withFont:self.font |
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lineBreakMode:UILineBreakModeWordWrap |
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alignment:NSTextAlignmentCenter]; |
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} |
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} |
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@end |
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#pragma mark - |
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#pragma mark MNEValueTrackingSlider implementations |
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@implementation MNEValueTrackingSlider |
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@synthesize thumbRect, textValue; |
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#pragma mark Private methods |
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- (void)_constructSlider { |
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valuePopupView = [[SliderValuePopupView alloc] initWithFrame:CGRectZero]; |
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valuePopupView.backgroundColor = [UIColor clearColor]; |
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valuePopupView.alpha = 0.0; |
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[self addSubview:valuePopupView]; |
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} |
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- (void)_fadePopupViewInAndOut:(BOOL)aFadeIn { |
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[UIView beginAnimations:nil context:NULL]; |
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[UIView setAnimationDuration:0.25]; |
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if (aFadeIn) { |
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valuePopupView.alpha = 1.0; |
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} else { |
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valuePopupView.alpha = 0.0; |
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} |
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[UIView commitAnimations]; |
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} |
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- (void)_positionAndUpdatePopupView { |
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CGRect _thumbRect = self.thumbRect; |
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CGRect popupRect = CGRectOffset(_thumbRect, 0, -floorf(_thumbRect.size.height * 1.5)); |
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// (-100, -15) determines the size of the the rect |
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popupRect = CGRectInset(popupRect, -100, -15); |
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|
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// this prevents drawing the popup outside the slider view |
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if (popupRect.origin.x < -self.frame.origin.x+5) |
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popupRect.origin.x = -self.frame.origin.x+5; |
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else if (popupRect.origin.x > self.superview.frame.size.width - popupRect.size.width - self.frame.origin.x - 5) |
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popupRect.origin.x = self.superview.frame.size.width - popupRect.size.width - self.frame.origin.x - 5; |
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//else if (CGRectGetMaxX(popupRect) > CGRectGetMaxX(self.superview.bounds)) |
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// popupRect.origin.x = CGRectGetMaxX(self.superview.bounds) - CGRectGetWidth(popupRect) - 1.0; |
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|
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valuePopupView.arrowOffset = CGRectGetMidX(_thumbRect) - CGRectGetMidX(popupRect); |
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|
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valuePopupView.frame = popupRect; |
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valuePopupView.text = self.textValue; |
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[valuePopupView setNeedsDisplay]; |
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} |
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|
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132 |
#pragma mark Memory management |
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|
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- (id)initWithFrame:(CGRect)frame { |
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self = [super initWithFrame:frame]; |
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if (self) { |
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[self _constructSlider]; |
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} |
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return self; |
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} |
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141 |
|
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- (id)initWithCoder:(NSCoder *)aDecoder { |
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self = [super initWithCoder:aDecoder]; |
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if (self) { |
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[self _constructSlider]; |
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} |
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return self; |
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} |
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149 |
|
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150 |
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151 |
#pragma mark - |
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#pragma mark UIControl touch event tracking |
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- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event { |
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// Fade in and update the popup view |
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CGPoint touchPoint = [touch locationInView:self]; |
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// Check if the knob is touched. Only in this case show the popup-view |
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if(CGRectContainsPoint(CGRectInset(self.thumbRect, -14.0, -12.0), touchPoint)) { |
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[self _positionAndUpdatePopupView]; |
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[self _fadePopupViewInAndOut:YES]; |
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} |
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return [super beginTrackingWithTouch:touch withEvent:event]; |
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} |
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|
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- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event { |
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// Update the popup view as slider knob is being moved |
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[self _positionAndUpdatePopupView]; |
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return [super continueTrackingWithTouch:touch withEvent:event]; |
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} |
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|
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- (void)cancelTrackingWithEvent:(UIEvent *)event { |
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[super cancelTrackingWithEvent:event]; |
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} |
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- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event { |
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// Fade out the popoup view |
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[self _fadePopupViewInAndOut:NO]; |
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[super endTrackingWithTouch:touch withEvent:event]; |
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} |
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180 |
#pragma mark - |
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#pragma mark Custom property accessors |
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- (CGRect)thumbRect { |
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CGRect trackRect = [self trackRectForBounds:self.bounds]; |
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CGRect thumbR = [self thumbRectForBounds:self.bounds |
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trackRect:trackRect |
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value:self.value]; |
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return thumbR; |
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} |
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@end |