iOS實現(xiàn)帶動畫的環(huán)形進度條

更新時間：2017年01月15日 09:55:20 作者：CUG

這篇文章主要為大家詳細介紹了iOS實現(xiàn)帶動畫的環(huán)形進度條，同時帶數(shù)字同步效果，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本篇寫的是實現(xiàn)環(huán)形進度條，并帶動畫效果，要實現(xiàn)這些，僅能通過自己畫一個

方法直接看代碼

為了方便多次調(diào)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(diào)用并非精確，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(shù)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(fā)現(xiàn)如果在tableviewcell中添加了這個環(huán)形進度條時有個缺點，就是定時器原本用的是系統(tǒng)的runloop，導(dǎo)致數(shù)據(jù)顯示滯后，所以現(xiàn)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(huán)形進度條的視圖寬度
#define ProgressWidth 2.5   //環(huán)形進度條的圓環(huán)寬度
#define Radius ViewWidth/2-ProgressWidth //環(huán)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(huán)形進度條底框
 CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0);
 CGContextDrawPath(progressContext, kCGPathStroke);
 
 // //繪制環(huán)形進度環(huán)
 CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5為改變初始位置
 
 // 進度數(shù)字字號,可自己根據(jù)自己需要，從視圖大小去適配字體字號
 int fontNum = ViewWidth/6;
 49 label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,Radius+10, ViewWidth/6)];
 label.center = CGPointMake(xCenter, yCenter);
 label.textAlignment = NSTextAlignmentCenter;
 label.font = [UIFont boldSystemFontOfSize:fontNum];
 label.text = @"0%";
 [self addSubview:label];
 
 UIBezierPath *path=[UIBezierPath bezierPath];
 [path addArcWithCenter:CGPointMake(xCenter,yCenter) radius:Radius startAngle:0 endAngle:to clockwise:YES];
 arcLayer=[CAShapeLayer layer];
 arcLayer.path=path.CGPath;//46,169,230
 arcLayer.fillColor = [UIColor clearColor].CGColor;
 arcLayer.strokeColor=[UIColor colorWithRed:227.0/255.0 green:91.0/255.0 blue:90.0/255.0 alpha:0.7].CGColor;
 arcLayer.lineWidth=ProgressWidth;
 arcLayer.backgroundColor = [UIColor blueColor].CGColor;
 [self.layer addSublayer:arcLayer];
 
 
 dispatch_async(dispatch_get_global_queue(0, 0), ^{
 [self drawLineAnimation:arcLayer];
 });
 
 if (self.progress > 1) {
 NSLog(@"傳入數(shù)值范圍為 0-1");
 self.progress = 1;
 }else if (self.progress < 0){
 NSLog(@"傳入數(shù)值范圍為 0-1");
 self.progress = 0;
 return;
 }
 
 if (self.progress > 0) {
 NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(newThread) object:nil];
 [thread start];
 }
 
}

-(void)newThread
{
 @autoreleasepool {
 progressTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(timeLabel) userInfo:nil repeats:YES];
 [[NSRunLoop currentRunLoop] run];
 }
}

//NSTimer不會精準調(diào)用
-(void)timeLabel
{
 _i += 0.01;
 label.text = [NSString stringWithFormat:@"%.0f%%",_i*100];
 
 if (_i >= self.progress) {
 [progressTimer invalidate];
 progressTimer = nil;
 
 }
 
}

//定義動畫過程
-(void)drawLineAnimation:(CALayer*)layer
{
 CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"];
 bas.duration=self.progress;//動畫時間
 bas.delegate=self;
 bas.fromValue=[NSNumber numberWithInteger:0];
 bas.toValue=[NSNumber numberWithInteger:1];
 [layer addAnimation:bas forKey:@"key"];
}
@end

完成后在要調(diào)用的控制器里，僅需幾段代碼：傳進的參數(shù)：為0-1

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

實現(xiàn)：

已經(jīng)實現(xiàn)進度條和數(shù)字的同步：