IOS animation ring progress bar and ios ring progress bar

IOS animation ring progress bar and ios ring progress bar

This article describes how to implement a ring progress bar with animation effects. To achieve this, you can only draw

Method to directly view the code

To facilitate multiple calls, use the method of inheriting UIView

. M file

1 #import <UIKit/UIKit.h>2 3 @interface LoopProgressView : UIView4 5 @property (nonatomic, assign) CGFloat progress;6 7 8 @end

 

. H file

NSTimer calls are not accurate. You can use Baidu

1 # import "LoopProgressView. h "2 # import <QuartzCore/QuartzCore. h> 3 4 # define ViewWidth self. frame. size. width // view width of the ring progress bar 5 # define ProgressWidth 2.5 // ring width 6 # define Radius ViewWidth/2-ProgressWidth // Radius of the ring progress bar 7 8 @ interface LoopProgressView () 9 {10 CAShapeLayer * arcLayer; 11 UILabel * label; 12 NSTimer * progresstyer; 13} 14 @ property (nonatomic, assign) CGFloat I; 15 @ end 16 17 @ implementation LoopProgressView 18 19-(id) initWithFrame :( CGRect) frame 20 {21 self = [super initWithFrame: frame]; 22 if (self) {23 self. backgroundColor = [UIColor clearColor]; 24} 25 return self; 26} 27 28-(void) drawRect :( CGRect) rect 29 {30 _ I = 0; 31 CGContextRef progressContext = UIGraphicsGetCurrentContext (); 32 CGContextSetLineWidth (progressContext, ProgressWidth); 33 CGContextSetRGBStrokeColor (progressContext, 209.0/255.0, 209.0/255.0, 209.0/255.0, 1 ); 34 35 CGFloat xCenter = rect. size. width * 0.5; 36 CGFloat yCenter = rect. size. height * 0.5; 37 38 // Bottom Frame of the ring progress bar 39 CGContextAddArc (progressContext, xCenter, yCenter, Radius, 0, 2 * M_PI, 0); 40 CGContextDrawPath (progressContext, kCGPathStroke ); 41 42 // draw the ring progress loop 43 CGFloat to = self. progress * M_PI * 2; //-M_PI * 0.5 to change the initial position. You can change the Initial Startup position of the progress bar to 44. // The progress font size. You can change the size according to your needs, adjust the font size from the View Size. Here 46 int fontNum = 15; 47 48 label = [[UILabel alloc] initWithFrame: CGRectMake (0, 0, Radius + 10, 20)]; 49 label. center = CGPointMake (xCenter, yCenter); 50 label. textAlignment = NSTextAlignmentCenter; 51 label. font = [UIFont boldSystemFontOfSize: fontNum]; 52 label. text = @ "0%"; 53 [self addSubview: label]; 54 55 UIBezierPath * path = [UIBezierPath bezierPath]; 56 [path addArcWithCenter: CGPointMake (xCenter, yCenter) radius: radius startAngle: 0 endAngle: to clockwise: YES]; 57 arcLayer = [CAShapeLayer layer]; 58 arcLayer. path = path. CGPath; // 46,169,230 59 arcLayer. fillColor = [UIColor clearColor]. CGColor; 60 arcLayer. strokeColor = [UIColor colorWithRed: 227.0/255.0 green: 91.0/255.0 blue: 90.0/255.0 alpha: 0.7]. CGColor; 61 arcLayer. lineWidth = ProgressWidth; 62 arcLayer. backgroundColor = [UIColor blueColor]. CGColor; 63 [self. layer addSublayer: arcLayer]; 64 65 66 dispatch_async (dispatch_get_global_queue (0, 0), ^ {67 [self drawLineAnimation: arcLayer]; 68}); 69 70 if (self. progress> 0) {71 progressTimer = [NSTimer scheduledTimerWithTimeInterval: 0.01 target: self selector: @ selector (timeLabel) userInfo: nil repeats: YES]; 72} 73 74} 75 76 // nstabel does not accurately call 77-(void) timeLabel 78 {79 _ I + = 0.01; 80 label. text = [NSString stringWithFormat: @ "%. 0f % ", _ I * 100]; 81 82 if (_ I> = self. progress) {83 [progressTimer invalidate]; 84 progressTimer = nil; 85 86} 87 88} 89 90 // define the animation process 91-(void) drawLineAnimation :( CALayer *) layer 92 {93 CABasicAnimation * bas = [CABasicAnimation animationWithKeyPath: @ "strokeEnd"]; 94 bas. duration = 1; 95 bas. delegate = self; 96 bas. fromValue = [NSNumber numberWithInteger: 0]; 97 bas. toValue = [NSNumber numberWithInteger: 1]; 98 [layer addAnimation: bas forKey: @ "key"]; 99} 100 101 @ end

 

 

In the Controller to be called, only a few pieces of code are required: The input parameter is 0-1.

1     LoopProgressView *custom = [[LoopProgressView alloc]initWithFrame:CGRectMake(50, 100, 100, 100)];2     custom.progress = 0.44;3     [self.view addSubview:custom];

 

After implementation:

There is no synchronous processing for numbers and progress bars. If you are interested, try: