-(void)drawRect:(CGRect)rect
{
// CGContextRef context = UIGraphicsGetCurrentContext();
// CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
//画弧线
// CGContextMoveToPoint(context, 50, 0);
// CGContextAddArc(context, 50, 50, 50, 270*M_PI/180, 0, 0);
// CGContextStrokePath(context);
//画椭圆形
// CGContextAddEllipseInRect(context, CGRectMake(0, 0, 300, 300));
// CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
// CGContextFillPath(context);
//画曲线
CGContextRefcontext =UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context,1);
CGContextSetStrokeColorWithColor(context, [UIColorredColor].CGColor);
CGContextMoveToPoint(context,100,100);
//(150, 100):控制点，（200, 200）：终点
CGContextAddQuadCurveToPoint(context,150,100,200,200);
CGContextStrokePath(context);
//贝塞尔路径画圆
UIBezierPath*bezierPath = [UIBezierPathbezierPathWithArcCenter:CGPointMake(120,120)
radius:100
startAngle:(CGFloat) -M_PI_2
endAngle:(CGFloat)2*M_PI*_progress
clockwise:YES];
bezierPath.lineWidth=10;
[[UIColorblueColor]setStroke];
[bezierPathstroke];
//CAShapeLayer
}
//动态更新贝塞尔路径
-(void)startAnimation
{
NSTimer*timer = [NSTimerscheduledTimerWithTimeInterval:1
target:self
selector:@selector(update)
userInfo:nil
repeats:YES];
[timerfire];
}
-(void)update
{
_progress+=0.1;
[selfsetNeedsDisplay];
}
//蒙版
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIImageView*backgroundImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(40,80,198,162)];
UIImageView*maskImageView = [[UIImageViewalloc]initWithFrame:backgroundImageView.bounds];
[maskImageViewsetImage:[UIImageimageNamed:@"bg.png"]];
backgroundImageView.layer.mask= maskImageView.layer;
UIImageView*imageView = [[UIImageViewalloc]initWithFrame:backgroundImageView.bounds];
[imageViewsetImage:[UIImageimageNamed:@"RI8[50WUPQ@TR~917UULUCR.jpg"]];
[backgroundImageViewaddSubview:imageView];
[self.viewaddSubview:backgroundImageView];
}
例子：
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setBackgroundColor:[UIColor clearColor]];
}
return self;
}
- (void)drawRect:(CGRect)rect {
// Drawing code
CGContextRef ctx = UIGraphicsGetCurrentContext();
//圆形
CGContextSetStrokeColorWithColor(ctx, [UIColor whiteColor].CGColor);
CGContextAddEllipseInRect(ctx,CGRectMake(0, 0, 100,100));
CGContextSetFillColorWithColor(ctx, [UIColor redColor].CGColor);
CGContextFillPath(ctx );
self.backgroundColor = [UIColor redColor];
//直线
// [[UIColor redColor] set ];
// CGContextSetLineWidth(ctx, 3);
// CGContextMoveToPoint(ctx, 0, 100);
// CGContextAddLineToPoint(ctx, 500, 100);
// CGContextStrokePath(ctx);
//绘制图片
UIImage *img = [UIImage imageNamed:@"test"];
[img drawAtPoint:CGPointMake(0, 200)];
}
