UAProgressView.m

//
//  UAProgressView.m
//  UAProgressView-Example
//
//  Created by Matt Coneybeare on 5/25/14.
//  Copyright (c) 2014 Urban Apps. All rights reserved.
//

#import "UAProgressView.h"

NSString * const UAProgressViewProgressAnimationKey = @"UAProgressViewProgressAnimationKey";

@interface UACircularProgressView : UIView

- (void)updateProgress:(CGFloat)progress;
- (CAShapeLayer *)shapeLayer;

@end

@interface UAProgressView () <UIGestureRecognizerDelegate>

@property (nonatomic, strong) UACircularProgressView *progressView;
@property (nonatomic, assign) int valueLabelProgressPercentDifference;
@property (nonatomic, strong) NSTimer *valueLabelUpdateTimer;

@end

@implementation UAProgressView
@synthesize tintColor = _tintColor;

#pragma mark - Init

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self sharedSetup];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self sharedSetup];
    }
    return self;
}

- (void)sharedSetup {
	self.progressView = [[UACircularProgressView alloc] initWithFrame:self.bounds];
	self.progressView.shapeLayer.fillColor = [UIColor clearColor].CGColor;
	[self addSubview:self.progressView];
	
	[self resetDefaults];
}

- (void)resetDefaults {
	
	self.fillChangedBlock = nil;
	self.didSelectBlock	= nil;
	self.progressChangedBlock = nil;
	self.centralView = nil;
	
	_fillOnTouch = YES;
	_progress = 0.0;
	_animationDuration = 0.3f;
	
	self.borderWidth = 1.0f;
	self.lineWidth = 2.0f;
	
	[self setupGestureRecognizer];
	
	[self tintColorDidChange];
}

- (void)setupGestureRecognizer {
	UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(touchDetected:)];
	gestureRecognizer.delegate = self;
	gestureRecognizer.minimumPressDuration = 0.0;
	[self addGestureRecognizer:gestureRecognizer];
}

#pragma mark - Public Accessors


- (void)setBorderWidth:(CGFloat)borderWidth {
	_borderWidth = borderWidth;
	self.progressView.shapeLayer.borderWidth = borderWidth;
}

- (void)setLineWidth:(CGFloat)lineWidth {
	_lineWidth = lineWidth;
	self.progressView.shapeLayer.lineWidth = lineWidth;
}

- (void)setCentralView:(UIView *)centralView {
	if (_centralView != centralView) {
		[_centralView removeFromSuperview];
		_centralView = centralView;
		[self addSubview:self.centralView];
	}
}

#pragma mark - Color

- (void)tintColorDidChange {
    if ([[self superclass] instancesRespondToSelector: @selector(tintColorDidChange)]) {
        [super tintColorDidChange];
    }
	
    UIColor *tintColor = self.tintColor;
	
    self.progressView.shapeLayer.strokeColor = tintColor.CGColor;
    self.progressView.shapeLayer.borderColor = tintColor.CGColor;
}

- (UIColor*) tintColor
{
    if (_tintColor == nil) {
        _tintColor = [UIColor colorWithRed: 0.0 green: 122.0/255.0 blue: 1.0 alpha: 1.0];
    }
    return _tintColor;
}

- (void) setTintColor:(UIColor *)tintColor
{
    [self willChangeValueForKey: @"tintColor"];
    _tintColor = tintColor;
    [self didChangeValueForKey: @"tintColor"];
    [self tintColorDidChange];
}

#pragma mark - Layout

- (void)layoutSubviews {
    [super layoutSubviews];
    
	self.progressView.frame = self.bounds;
	self.centralView.center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
}

#pragma mark - Progress Control

- (void)setProgress:(CGFloat)progress animated:(BOOL)animated {
    
	progress = MAX( MIN(progress, 1.0), 0.0); // keep it between 0 and 1
	
	if (_progress == progress) {
		return;
	}
	
	if (animated) {
		
		[self animateToProgress:progress];
		
	} else {
		
		[self stopAnimation];
		_progress = progress;
		[self.progressView updateProgress:_progress];
		
	}
	
	if (self.progressChangedBlock) {
		self.progressChangedBlock(self, _progress);
	}
}

- (void)setProgress:(CGFloat)progress {
	[self setProgress:progress animated:NO];
}

- (void)setAnimationDuration:(CFTimeInterval)animationDuration {
	if (_animationDuration < 0)
		return;
	
    _animationDuration = animationDuration;
}

- (void)animateToProgress:(CGFloat)progress {
    [self stopAnimation];
    
    // Add shape animation
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;
    animation.duration = self.animationDuration;
    animation.fromValue = @(self.progress);
    animation.toValue = @(progress);
    animation.delegate = self;
    [self.progressView.layer addAnimation:animation forKey:UAProgressViewProgressAnimationKey];
    
    // Add timer to update valueLabel
	_valueLabelProgressPercentDifference = (progress - self.progress) * 100;
    CFTimeInterval timerInterval =  self.animationDuration / ABS(_valueLabelProgressPercentDifference);
    self.valueLabelUpdateTimer = [NSTimer scheduledTimerWithTimeInterval:timerInterval
                                                                  target:self
                                                                selector:@selector(onValueLabelUpdateTimer:)
                                                                userInfo:nil
                                                                 repeats:YES];
    
    
    _progress = progress;
}

- (void)stopAnimation {
    // Stop running animation
    [self.progressView.layer removeAnimationForKey:UAProgressViewProgressAnimationKey];
    
    // Stop timer
    [self.valueLabelUpdateTimer invalidate];
    self.valueLabelUpdateTimer = nil;
}

- (void)onValueLabelUpdateTimer:(NSTimer *)timer {
    if (_valueLabelProgressPercentDifference > 0) {
        _valueLabelProgressPercentDifference--;
    } else {
        _valueLabelProgressPercentDifference++;
    }
}

#pragma mark - Highlighting

- (void)addFill {
	if (self.fillOnTouch) {
		// update the layer model
		self.progressView.layer.backgroundColor = [self tintColor].CGColor;
		
		// call block
		if (self.fillChangedBlock) {
			self.fillChangedBlock(self, YES, NO);
		}
	}
}

- (void)removeFillAnimated:(BOOL)animated {
	if (self.fillOnTouch) {
		
		// add the fade-out animation
		if (animated) {
			CABasicAnimation *highlightAnimation = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
			highlightAnimation.fromValue           = (id)self.progressView.layer.backgroundColor;
			highlightAnimation.toValue             = (id)[UIColor clearColor].CGColor;
			highlightAnimation.removedOnCompletion = NO;
			[self.progressView.layer addAnimation:highlightAnimation forKey:@"backgroundColor"];
		}
		
		// update the layer model.
		self.progressView.layer.backgroundColor = [UIColor clearColor].CGColor;
		
		// call block
		if (self.fillChangedBlock) {
			self.fillChangedBlock(self, NO, animated);
		}
	}
}

- (void)removeFill {
	[self removeFillAnimated:YES];
}

#pragma mark - CAAnimationDelegate

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
    [self.progressView updateProgress:_progress];
    [self.valueLabelUpdateTimer invalidate];
    self.valueLabelUpdateTimer = nil;
}

#pragma mark - Gesture Recognizers

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if (self.centralView && [touch.view isDescendantOfView:self.centralView] && self.centralView.userInteractionEnabled) {
		return NO;
    }
	
    return YES;
}

- (void)touchDetected:(UILongPressGestureRecognizer *)gestureRecognizer {
	
	CGPoint touch = [gestureRecognizer locationOfTouch:0 inView:self];
	
	if (UIGestureRecognizerStateBegan == gestureRecognizer.state) {	// press is being held down
		
		[self addFill];
		
	} else if (UIGestureRecognizerStateChanged == gestureRecognizer.state) {	// press was recognized, but then moved
		
		if (CGRectContainsPoint(self.bounds, touch)) {
			
			[self addFill];
			
		} else {
			
			[self removeFillAnimated:NO];
			
		}
		
    } else if (UIGestureRecognizerStateEnded == gestureRecognizer.state) { // the touch has been picked up
		
		if (CGRectContainsPoint(self.bounds, touch)) {
			
			[self removeFill];
			
			if (self.didSelectBlock) {
				self.didSelectBlock(self);
			}
			
		} else {
			
			[self removeFillAnimated:NO];
			
		}
		
    } else {
		
		[self removeFillAnimated:NO];
		
	}
	
}

@end

#pragma mark - UACircularProgressView

@implementation UACircularProgressView

+ (Class)layerClass {
    return CAShapeLayer.class;
}

- (CAShapeLayer *)shapeLayer {
    return (CAShapeLayer *)self.layer;
}

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
		[self updateProgress:0];
    }
	
    return self;
}

- (void)layoutSubviews {
	[super layoutSubviews];
	
	self.shapeLayer.cornerRadius = self.frame.size.width / 2.0f;
    self.shapeLayer.path = [self layoutPath].CGPath;
}

- (UIBezierPath *)layoutPath {
    const double TWO_M_PI = 2.0 * M_PI;
    const double startAngle = 0.75 * TWO_M_PI;
    const double endAngle = startAngle + TWO_M_PI;
    
    CGFloat width = self.frame.size.width;
	CGFloat borderWidth = self.shapeLayer.borderWidth;
    return [UIBezierPath bezierPathWithArcCenter:CGPointMake(width/2.0f, width/2.0f)
                                          radius:width/2.0f - borderWidth
                                      startAngle:startAngle
                                        endAngle:endAngle
                                       clockwise:YES];
}

- (void)updateProgress:(CGFloat)progress {
    [self updatePath:progress];
}

- (void)updatePath:(CGFloat)progress {
	[CATransaction begin];
	[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
	self.shapeLayer.strokeEnd = progress;
	[CATransaction commit];
}

@end