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本篇寫的是實(shí)現(xiàn)環(huán)形進(jìn)度條,并帶動(dòng)畫效果,要實(shí)現(xiàn)這些,僅能通過(guò)自己畫一個(gè)
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?yàn)槊?.01s啟動(dòng)一次定時(shí)器,所以要同步進(jìn)度條和數(shù)字,就將self.progress賦值給動(dòng)畫的duration屬性就可以了,duration為動(dòng)畫時(shí)間。
在使用時(shí)我發(fā)現(xiàn)如果在tableviewcell中添加了這個(gè)環(huán)形進(jìn)度條時(shí)有個(gè)缺點(diǎn),就是定時(shí)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(shí)器,子線程的定時(shí)器必須添加[[NSRunLoop currentRunLoop] run];才可啟動(dòng)定時(shí)器,因?yàn)樽泳€程的runloop里是不帶nstimer的,要手動(dòng)添加運(yùn)行。
#import "LoopProgressView.h" #import <QuartzCore/QuartzCore.h> #define ViewWidth self.frame.size.width //環(huán)形進(jìn)度條的視圖寬度 #define ProgressWidth 2.5 //環(huán)形進(jìn)度條的圓環(huán)寬度 #define Radius ViewWidth/2-ProgressWidth //環(huán)形進(jìn)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(jìn)度條底框 CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0); CGContextDrawPath(progressContext, kCGPathStroke); // //繪制環(huán)形進(jìn)度環(huán) CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5為改變初始位置 // 進(jìn)度數(shù)字字號(hào),可自己根據(jù)自己需要,從視圖大小去適配字體字號(hào) 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(huì)精準(zhǔn)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(dòng)畫過(guò)程 -(void)drawLineAnimation:(CALayer*)layer { CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"]; bas.duration=self.progress;//動(dòng)畫時(shí)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(jìn)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(shí)現(xiàn):
已經(jīng)實(shí)現(xiàn)進(jìn)度條和數(shù)字的同步:
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