Objective-C：圓形進度視圖

Question

如何使用默認progresView製作progressview，就像在應用商店中一樣？

如圖片如下圖所示：

Answer 1

您可以使用此代碼，我已經畫了圓圈爲您服務。

- (void)viewDidLoad { 
[super viewDidLoad]; 
// Do any additional setup after loading the view, typically from a nib. 

CAShapeLayer* outsideShapeLayer = [[CAShapeLayer alloc] init]; 
outsideShapeLayer.fillColor = [[UIColor clearColor] CGColor]; 
outsideShapeLayer.frame = CGRectMake(100, 100, 100, 100); 
outsideShapeLayer.path = [[UIBezierPath bezierPathWithOvalInRect:outsideShapeLayer.bounds] CGPath]; 
outsideShapeLayer.lineWidth = 1; 
outsideShapeLayer.strokeColor = [[UIColor blueColor] CGColor]; 
[self.view.layer addSublayer:outsideShapeLayer]; 


CAShapeLayer* shapeLayer = [[CAShapeLayer alloc] init]; 
shapeLayer.fillColor = [[UIColor clearColor] CGColor]; 
shapeLayer.frame = CGRectMake(102.5, 102.5, 95, 95); 
shapeLayer.path = [[UIBezierPath bezierPathWithOvalInRect:shapeLayer.bounds] CGPath]; 
shapeLayer.lineWidth = 5; 
shapeLayer.strokeColor = [[UIColor blueColor] CGColor]; 
shapeLayer.strokeStart = 0; 
shapeLayer.strokeEnd = 0.75f; 
[self.view.layer addSublayer:shapeLayer]; 
} 

希望它能幫助你。