进度条在iOS开发中很常见的，我在项目开发中也写过好多进度条，有好多种类的，条形，圆形等，今天给大家总结一种圆形的开发进度条。自定义条形进度条
原理很简单我就不说了,自己看代码很容易理解,代码也有注释，直接上效果和代码了。。
#######效果图
1.gif
#######部分代码
/** 画板 */
- (void)drawRect:(CGRect)rect {
// 创建一个track shape layer
_trackLayer = [CAShapeLayer layer];
_trackLayer.frame = self.bounds;
_trackLayer.fillColor = [[UIColor clearColor] CGColor];
_trackLayer.strokeColor = [[UIColor cyanColor] CGColor];
[self.layer addSublayer:_trackLayer];
// 指定path的渲染颜色
_trackLayer.opacity = 1; // 背景透明度
_trackLayer.lineCap = kCALineCapRound;// 指定线的边缘是圆的
_trackLayer.lineWidth = PROGRESS_LINE_WIDTH; // 线的宽度
// 上面说明过了用来构建圆形
/*
center：圆心的坐标
radius：半径
startAngle：起始的弧度
endAngle：圆弧结束的弧度
clockwise：YES为顺时针，No为逆时针
方法里面主要是理解startAngle与endAngle
*/
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
radius:self.frame.size.width/2
startAngle:degreesToRadians(270)
endAngle:degreesToRadians(-90) clockwise:NO];
_trackLayer.path = [path CGPath]; // 把path传递給layer，然后layer会处理相应的渲染，整个逻辑和CoreGraph是一致的。
_progressLayer = [CAShapeLayer layer];
_progressLayer.frame = self.bounds;
_progressLayer.fillColor = [[UIColor clearColor] CGColor];
_progressLayer.strokeColor = [[UIColor redColor] CGColor];
_progressLayer.lineCap = kCALineCapRound;
_progressLayer.lineWidth = PROGRESS_LINE_WIDTH;
_progressLayer.path = [path CGPath];
_progressLayer.opacity = 1;
_progressLayer.strokeEnd = 0;
[self.layer addSublayer:_progressLayer];
}
-(instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor clearColor];
[self setUpSubViews];
}
return self;
}
- (void)setUpSubViews{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, (self.frame.size.height-20)/2, self.frame.size.width, 20)];
label.textColor = [UIColor blueColor];
label.textAlignment =1;
self.lable = label;
[self addSubview:label];
}
-(void)CircularProgressViewStart{
if (self.timer == nil) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(ChangeCircleValue:) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
});
}
}
-(void)ChangeCircleValue:(NSTimer *)timer{
if (self.progress >= self.signProgress){
[self.timer invalidate];
self.timer = nil;
return;
}
self.progress += 0.01;
self.lable.text = [NSString stringWithFormat:@"%.1f％",self.progress * 100];
_progressLayer.strokeEnd = self.progress;
}
2016年09月26日 未完待续。。 有什么问题可以提出意见。。自定义圆形进度条GitHubDemo
