LFRoundProgressView.m

#import "LFRoundProgressView.h"



static const CGFloat kDetailsLabelFontSize = 12.f;
static const CGFloat kAnnularLineWith = 4.f;

@implementation LFRoundProgressView{
    UILabel *_percentLabel;
    BOOL _percentShow;
}

#pragma mark - Lifecycle

- (id)init {
	return [self initWithFrame:CGRectMake(0.f, 0.f, 37.f, 37.f)];
}

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

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

- (void)setupStrings{
    self.backgroundColor = [UIColor clearColor];
    self.opaque = NO;
    _progress = 0.f;
    _progressTintColor = [[UIColor alloc] initWithWhite:1.f alpha:1.f];
    _progressBackgroundColor = [[UIColor alloc] initWithWhite:1.f alpha:.1f];
    _backgroundTintColor = [[UIColor alloc] initWithWhite:1.f alpha:.1f];
    
    _percentLabelTextColor =[UIColor whiteColor];
    _percentLabelFont =[UIFont boldSystemFontOfSize:kDetailsLabelFontSize];
    
    
    _annular = YES;//Defaults to YES: 环形
    _annularLineCapStyle = kCGLineCapButt;// kCGLineCapButt is Defaults
    _annularLineWith = kAnnularLineWith;
    
    
    _percentShow = YES;//show percent
    
    _percentLabel = [[UILabel alloc] initWithFrame:self.bounds];
    _percentLabel.adjustsFontSizeToFitWidth = NO;
    #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_6_0
        _percentLabel.textAlignment = NSTextAlignmentCenter;
    #else
        _percentLabel.textAlignment = UITextAlignmentCenter;
    #endif
    _percentLabel.opaque = NO;
    _percentLabel.backgroundColor = [UIColor clearColor];
    _percentLabel.textColor = _percentLabelTextColor;
    _percentLabel.font = _percentLabelFont;
    _percentLabel.text = @"0%";
    _percentLabel.hidden = !_percentShow;
    [self addSubview:_percentLabel];
    
    
    [self registerForKVO];
}

- (void)dealloc {
	[self unregisterFromKVO];
#if !__has_feature(objc_arc)
	[_progressTintColor release];
    [_progressBackgroundColor release];
	[_backgroundTintColor release];
    [_pecentLabel release];
    [_percentLabelFont release];
    [_percentLabelTextColor release];
	[super dealloc];
#endif
}

- (void)setPercentShow:(BOOL)show {
	_percentShow = show;
	_percentLabel.hidden = !show;
}

#pragma mark - Drawing

- (void)drawRect:(CGRect)rect {
    if(_percentShow){
        _percentLabel.text = [NSString stringWithFormat:@"%.0f%%",roundf(self.progress *100.0)];
        _percentLabel.textColor = self.percentLabelTextColor;
        _percentLabel.font = self.percentLabelFont;
    }
    if (_annular) {
        // Draw background
		CGFloat lineWidth = self.annularLineWith;
		UIBezierPath *processBackgroundPath = [UIBezierPath bezierPath];
		processBackgroundPath.lineWidth = lineWidth;
		processBackgroundPath.lineCapStyle = kCGLineCapRound;
		CGPoint center = CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2);
		CGFloat radius = (MIN(self.bounds.size.width,self.bounds.size.height) - lineWidth)/2;
		CGFloat startAngle = - ((float)M_PI / 2); // 90 degrees
		CGFloat endAngle = (2 * (float)M_PI) + startAngle;
		[processBackgroundPath addArcWithCenter:center radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
		[_backgroundTintColor set];
		[processBackgroundPath stroke];
		// Draw progress
		UIBezierPath *processPath = [UIBezierPath bezierPath];
		processPath.lineCapStyle = self.annularLineCapStyle;
		processPath.lineWidth = lineWidth;
		endAngle = (self.progress * 2 * (float)M_PI) + startAngle;
		[processPath addArcWithCenter:center radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
		[_progressTintColor set];
		[processPath stroke];
	} else {
        CGRect allRect = self.bounds;
        CGRect circleRect = CGRectInset(allRect, 2.0f, 2.0f);
        CGContextRef context = UIGraphicsGetCurrentContext();
        
		// Draw background
		[_progressTintColor setStroke];
		[_backgroundTintColor setFill];
		CGContextSetLineWidth(context, 2.0f);
		CGContextFillEllipseInRect(context, circleRect);
		CGContextStrokeEllipseInRect(context, circleRect);
		// Draw progress
		CGPoint center = CGPointMake(allRect.size.width / 2, allRect.size.height / 2);
		CGFloat radius = (MIN(allRect.size.width,allRect.size.height) - 4) / 2;
		CGFloat startAngle = - ((float)M_PI / 2); // 90 degrees
		CGFloat endAngle = (self.progress * 2 * (float)M_PI) + startAngle;
		CGContextSetFillColorWithColor(context, self.progressBackgroundColor.CGColor);
		CGContextMoveToPoint(context, center.x, center.y);
		CGContextAddArc(context, center.x, center.y, radius, startAngle, endAngle, 0);
		CGContextClosePath(context);
		CGContextFillPath(context);
	}
    
    
}

#pragma mark - KVO

- (void)registerForKVO {
	for (NSString *keyPath in [self observableKeypaths]) {
		[self addObserver:self forKeyPath:keyPath options:NSKeyValueObservingOptionNew context:NULL];
	}
}

- (void)unregisterFromKVO {
	for (NSString *keyPath in [self observableKeypaths]) {
		[self removeObserver:self forKeyPath:keyPath];
	}
}

- (NSArray *)observableKeypaths {
	return [NSArray arrayWithObjects:
            @"progressTintColor",
            @"backgroundTintColor",
            @"progressBackgroundColor",
            @"progress",
            @"percentShow",
            @"percentLabelTextColor",
            @"percentLabelFont",
            @"annular",
            @"annularLineCapStyle",
            @"annularLineWith",
            nil];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
	[self setNeedsDisplay];
}

@end