Use the UIBezierPath array to hollow out the UIView.

Use the UIBezierPath array to hollow out the UIView.

Use the UIBezierPath array to hollow out the UIView

 

Effect

 

Source code

/// CutOutClearView. h // CutOutMaskView // Created by YouXianMing on 16/7/8. // Copyright©2016 YouXianMing. all rights reserved. // # import <UIKit/UIKit. h> @ interface CutOutClearView: UIView @ property (nonatomic, strong) UIColor * fillColor; @ property (nonatomic, strong) NSArray <UIBezierPath *> * paths; @ end

/// CutOutClearView. m // CutOutMaskView // Created by YouXianMing on 16/7/8. // Copyright©2016 YouXianMing. all rights reserved. // # import "CutOutClearView. h "@ implementation CutOutClearView-(instancetype) initWithFrame :( CGRect) frame {if (self = [super initWithFrame: frame]) {self. fillColor = [UIColor whiteColor]; self. backgroundColor = [UIColor clearColor]; self. opaque = NO;} return self;}-(void) drawRect :( CGRect) rect {[super drawRect: rect]; [self. fillColor setFill]; UIRectFill (rect); CGContextRef context = UIGraphicsGetCurrentContext (); for (UIBezierPath * path in self. paths) {CGContextAddPath (context, path. CGPath); CGContextSetBlendMode (context, kCGBlendModeClear); CGContextFillPath (context) ;}}@ end

/// ViewController. m // CutOutClearView /// Created by YouXianMing on 16/7/8. // Copyright©2016 YouXianMing. all rights reserved. // # import "ViewController. h "# import" CutOutClearView. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; UIImageView * imageView = [[UIImageView alloc] initWithFrame: self. view. bounds]; imageView. image = [UIImage imageNamed: @ "bg.png"]; imageView. contentMode = UIViewContentModeScaleAspectFill; [self. view addSubview: imageView]; NSMutableArray * paths = [NSMutableArray array]; {UIBezierPath * bezierPath = [describezierpath]; [bezierPath moveToPoint: CGPointMake (57.04, 31.19)] [bezierPath addLineToPoint: CGPointMake (125.55, 12.5)]; [bezierPath addLineToPoint: CGPointMake (185.5, 91)]; [bezierPath addLineToPoint: CGPointMake (57.04, 169.5)]; [bezierPath addLineToPoint: CGPointMake (18.5, 91)]; [bezierPath addLineToPoint: CGPointMake (57.04, 31.19)]; [bezierPath closePath]; [paths addObject: bezierPath];} {Pipeline * bezierPath = [UIBezierPath bezierPath]; [bezierPath moveToPoint: CGPointMake (46.5, 245.5)]; [bezierPath addLineToPoint: CGPointMake (137.5, 272.5)]; [bezierPath addLineToPoint: CGPointMake (137.5, 211.5)]; [bezierPath addLineToPoint: CGPointMake (90.5, 196.5)]; [bezierPath addLineToPoint: CGPointMake (46.5, 211.5)]; [bezierPath addLineToPoint: CGPointMake (46.5, (245.5)]; [bezierPath closePath]; [paths addObject: bezierPath];} CutOutClearView * cutOutView = [[CutOutClearView alloc] initWithFrame: self. view. bounds]; cutOutView. fillColor = [UIColor redColor]; cutOutView. paths = paths; // [self. view addSubview: cutOutView]; imageView. maskView = cutOutView;} @ end

 

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