iOS帶動畫的環形進度條(進度條和數字同步)

本篇寫的是實現環形進度條，並帶動畫效果，要實現這些，僅能通過自己畫一個

方法直接看代碼　　demo下載：LoopProgressViewDemo.zip

為了方便多次調用，用繼承UIView的方式

.m文件

#import <UIKit/UIKit.h>

@interface LoopProgressView : UIView

@property (nonatomic, assign) CGFloat progress;


@end

 

.h文件

NSTimer的調用並非精確，可以自行百度

 這里因為每0.01s啟動一次定時器，所以要同步進度條和數字，就將self.progress賦值給動畫的duration屬性就可以了，duration為動畫時間

 在使用時我發現如果在tableviewcell中添加了這個環形進度條時有個缺點，就是定時器原本用的是系統的runloop，導致數據顯示滯后，所以現更新為子線程里添加定時器，子線程的定時器必須添加

[[NSRunLoop currentRunLoop] run];才可啟動定時器，因為子線程的runloop里是不帶nstimer的，要手動添加運行

#import "LoopProgressView.h"
#import <QuartzCore/QuartzCore.h>

#define ViewWidth self.frame.size.width   //環形進度條的視圖寬度
#define ProgressWidth 2.5                 //環形進度條的圓環寬度
#define Radius ViewWidth/2-ProgressWidth  //環形進度條的半徑

@interface LoopProgressView()
{
    CAShapeLayer *arcLayer;
    UILabel *label;
    NSTimer *progressTimer;
}
@property (nonatomic,assign)CGFloat i;

@end

@implementation LoopProgressView

-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
    }
    return self;
}

-(void)drawRect:(CGRect)rect
{
    _i=0;
    CGContextRef progressContext = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(progressContext, ProgressWidth);
    CGContextSetRGBStrokeColor(progressContext, 209.0/255.0, 209.0/255.0, 209.0/255.0, 1);
    
    CGFloat xCenter = rect.size.width * 0.5;
    CGFloat yCenter = rect.size.height * 0.5;
    
    //繪制環形進度條底框
    CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0);
    CGContextDrawPath(progressContext, kCGPathStroke);
    
    //    //繪制環形進度環
    CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5為改變初始位置
    
    // 進度數字字號,可自己根據自己需要，從視圖大小去適配字體字號
    int fontNum = ViewWidth/6;
 48
 49     label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,Radius+10, ViewWidth/6)];

    label.center = CGPointMake(xCenter, yCenter);

label.textAlignment = NSTextAlignmentCenter;  52 label.font = [UIFont boldSystemFontOfSize:fontNum];  53 label.text = @"0%";  54  [self addSubview:label];  55  56 UIBezierPath *path=[UIBezierPath bezierPath];  57 [path addArcWithCenter:CGPointMake(xCenter,yCenter) radius:Radius startAngle:0 endAngle:to clockwise:YES];  58 arcLayer=[CAShapeLayer layer];  59 arcLayer.path=path.CGPath;//46,169,230  60 arcLayer.fillColor = [UIColor clearColor].CGColor;  61 arcLayer.strokeColor=[UIColor colorWithRed:227.0/255.0 green:91.0/255.0 blue:90.0/255.0 alpha:0.7].CGColor;  62 arcLayer.lineWidth=ProgressWidth;  63 arcLayer.backgroundColor = [UIColor blueColor].CGColor;  64  [self.layer addSublayer:arcLayer];  65  66  67 dispatch_async(dispatch_get_global_queue(0, 0), ^{  68  [self drawLineAnimation:arcLayer];  69  });  70  71 if (self.progress > 1) {  72 NSLog(@"傳入數值范圍為 0-1");  73 self.progress = 1;  74 }else if (self.progress < 0){  75 NSLog(@"傳入數值范圍為 0-1");  76 self.progress = 0;  77 return;  78  }  79  80 if (self.progress > 0) {  81 NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(newThread) object:nil];  82  [thread start];  83  }  84  85 }  86  87 -(void)newThread  88 {  89  @autoreleasepool {  90 progressTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(timeLabel) userInfo:nil repeats:YES];  91  [[NSRunLoop currentRunLoop] run];  92  }  93 }  94  95 //NSTimer不會精准調用  96 -(void)timeLabel  97 {  98 _i += 0.01;  99 label.text = [NSString stringWithFormat:@"%.0f%%",_i*100]; 100 101 if (_i >= self.progress) {
 [progressTimer invalidate];

progressTimer = nil; 104 105  } 106 107 } 108 109 //定義動畫過程 110 -(void)drawLineAnimation:(CALayer*)layer 111 { 112 CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"]; 113 bas.duration=self.progress;//動畫時間 114 bas.delegate=self; 115 bas.fromValue=[NSNumber numberWithInteger:0]; 116 bas.toValue=[NSNumber numberWithInteger:1]; 117 [layer addAnimation:bas forKey:@"key"]; 118 } 119 120 @end

 

 

 

完成后在要調用的控制器里，僅需幾段代碼：傳進的參數：為0-1

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

 

實現后：

已經實現進度條和數字的同步：