UIView中间透明周围半透明(四种方法)

 

 

方法一

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#import "DrawView.h" @implementation DrawView - (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { //设置 背景为clear self.backgroundColor = [UIColor clearColor]; self.opaque = NO; } return self; } - (void)drawRect:(CGRect)rect { [[UIColor colorWithWhite:0 alpha:0.5] setFill]; //半透明区域 UIRectFill(rect); //透明的区域 CGRect holeRection = CGRectMake(100, 200, 200, 200); /** union: 并集 CGRect CGRectUnion(CGRect r1, CGRect r2) 返回并集部分rect */ /** Intersection: 交集 CGRect CGRectIntersection(CGRect r1, CGRect r2) 返回交集部分rect */ CGRect holeiInterSection = CGRectIntersection(holeRection, rect); [[UIColor clearColor] setFill]; //CGContextClearRect(ctx, <#CGRect rect#>) //绘制 //CGContextDrawPath(ctx, kCGPathFillStroke); UIRectFill(holeiInterSection); }

 

直接添加使用就行

    DrawView *drawView = [[DrawView alloc] initWithFrame:[UIScreen mainScreen].bounds]; [self.view addSubview:drawView]; 

 

方法二

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#import "DrawViewArc.h" @implementation DrawViewArc - (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor clearColor]; self.opaque = NO; } return self; } - (void)drawRect:(CGRect)rect { //中间镂空的矩形框 CGRect myRect =CGRectMake(100,100,200, 200); //背景 UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:0]; //镂空 UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:myRect]; [path appendPath:circlePath]; [path setUsesEvenOddFillRule:YES]; CAShapeLayer *fillLayer = [CAShapeLayer layer]; fillLayer.path = path.CGPath; fillLayer.fillRule = kCAFillRuleEvenOdd; fillLayer.fillColor = [UIColor whiteColor].CGColor; fillLayer.opacity = 0.5; [self.layer addSublayer:fillLayer]; } 

 

也是直接调用就行 

方法三

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写到需要添加 透明圆的 view里

- (void)addArc {
    //中间镂空的矩形框
    CGRect myRect =CGRectMake(100,100,200, 200); //背景 UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:[UIScreen mainScreen].bounds cornerRadius:0]; //镂空 UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:myRect]; [path appendPath:circlePath]; [path setUsesEvenOddFillRule:YES]; CAShapeLayer *fillLayer = [CAShapeLayer layer]; fillLayer.path = path.CGPath; fillLayer.fillRule = kCAFillRuleEvenOdd; fillLayer.fillColor = [UIColor whiteColor].CGColor; fillLayer.opacity = 0.5; [self.view.layer addSublayer:fillLayer]; } 

 

调用 
[self addArc];

方法四

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#import "DrawArc.h" @implementation DrawArc - (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor clearColor]; self.opaque = NO; } return self; } - (void)drawRect:(CGRect)rect { //中间镂空的矩形框 CGRect myRect =CGRectMake(100,100,200, 200); CGContextRef ctx = UIGraphicsGetCurrentContext(); //背景色 //[[UIColor colorWithPatternImage:[UIImage imageNamed:@"1.jpg"]] set]; [[UIColor colorWithWhite:0 alpha:0.5] set]; CGContextAddRect(ctx, rect); CGContextFillPath(ctx); //设置清空模式 /** kCGBlendModeClear, kCGBlendModeCopy, kCGBlendModeSourceIn, kCGBlendModeSourceOut, kCGBlendModeSourceAtop, kCGBlendModeDestinationOver, kCGBlendModeDestinationIn, kCGBlendModeDestinationOut, kCGBlendModeDestinationAtop, kCGBlendModeXOR, kCGBlendModePlusDarker, kCGBlendModePlusLighter */ CGContextSetBlendMode(ctx, kCGBlendModeClear); //画圆 CGContextAddEllipseInRect(ctx, myRect); //填充 CGContextFillPath(ctx); }