本篇写的是实现环形进度条，并带动画效果，要实现这些，仅能通过自己画一个
方法直接看代码
为了方便多次调用，用继承uiview的方式
.m文件
#import <uikit/uikit.h> @interface loopprogressview : uiview @property (nonatomic, assign) cgfloat progress; @end
.h文件
nstimer的调用并非精确，可以自行百度
这里因为每0.01s启动一次定时器，所以要同步进度条和数字，就将self.progress赋值给动画的duration属性就可以了，duration为动画时间。
在使用时我发现如果在tableviewcell中添加了这个环形进度条时有个缺点，就是定时器原本用的是系统的runloop，导致数据显示滞后，所以现更新为子线程里添加定时器，子线程的定时器必须添加[[nsrunloop currentrunloop] run];才可启动定时器，因为子线程的runloop里是不带nstimer的，要手动添加运行。
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#import "loopprogressview.h"
#import <quartzcore/quartzcore.h>
#define viewwidth self.frame.size.width //环形进度条的视图宽度
#define progresswidth 2.5 //环形进度条的圆环宽度
#define radius viewwidth/2-progresswidth //环形进度条的半径
@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;
//绘制环形进度条底框
cgcontextaddarc(progresscontext, xcenter, ycenter, radius, 0, 2*m_pi, 0);
cgcontextdrawpath(progresscontext, kcgpathstroke);
// //绘制环形进度环
cgfloat to = self.progress * m_pi * 2; // - m_pi * 0.5为改变初始位置
// 进度数字字号,可自己根据自己需要，从视图大小去适配字体字号
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(@"传入数值范围为 0-1");
self.progress = 1;
}else if (self.progress < 0){
nslog(@"传入数值范围为 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不会精准调用
-(void)timelabel
{
_i += 0.01;
label.text = [nsstring stringwithformat:@"%.0f%%",_i*100];
if (_i >= self.progress) {
[progresstimer invalidate];
progresstimer = nil;
}
}
//定义动画过程
-(void)drawlineanimation:(calayer*)layer
{
cabasicanimation *bas=[cabasicanimation animationwithkeypath:@"strokeend"];
bas.duration=self.progress;//动画时间
bas.delegate=self;
bas.fromvalue=[nsnumber numberwithinteger:0];
bas.tovalue=[nsnumber numberwithinteger:1];
[layer addanimation:bas forkey:@"key"];
}
@end
完成后在要调用的控制器里，仅需几段代码：传进的参数：为0-1
loopprogressview *custom = [[loopprogressview alloc]initwithframe:cgrectmake(50, 100, 100, 100)]; custom.progress = 0.44; [self.view addsubview:custom];
实现：
已经实现进度条和数字的同步：
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