画线
- (void)drawRect:(CGRect)rect{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(context, 10, 10);
CGContextAddLineToPoint(context, 30, 100);
CGContextStrokePath(context);
}
画三角形
- (void)drawRect:(CGRect)rect{
//画三角形
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1);
CGContextMoveToPoint(context, 10, 10);
CGContextAddLineToPoint(context, 110, 10);
CGContextAddLineToPoint(context, 110, 110);
CGContextClosePath(context);
CGContextStrokePath(context);
}
画矩形
- (void)drawRect:(CGRect)rect{
//画矩形
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddRect(context, CGRectMake(10, 20, 100, 100));
//CGContextFillPath(context);
CGContextStrokePath(context);
}
画扇形
- (void)drawRect:(CGRect)rect{
//画扇形
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(context, 100, 100);
CGContextAddArc(context, 100, 100,60, - 3 * M_PI_4, -M_PI_4, 1);
CGContextClosePath(context);
CGContextStrokePath(context);
}
画弧
-(void)drawArc{
CGContextRef context = UIGraphicsGetCurrentContext();
//x,y 圆心
//radius 半径
//startAngle 画弧的起始位置
//endAngel 画弧的结束位置
//clockwise 0 顺针 1 逆时针
CGContextAddArc(context, 100, 100, 60, 0, M_PI, 1);
CGContextClosePath(context);
//渲染
CGContextStrokePath(context);
//CGContextFillPath(context);
}
画圆
- (void)drawRect:(CGRect)rect{
//画圆
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddEllipseInRect(context, CGRectMake(10, 10, 100, 100));
CGContextStrokePath(context);
}
画图片
- (void)drawRect:(CGRect)rect{
//画图片
UIImage *image = [UIImage imageNamed:@"papa"];
[image drawAsPatternInRect:CGRectMake(10, 10, 50, 50)];
}
画文字
- (void)drawRect:(CGRect)rect{
//画文字
NSString *str = @"啦啦啦啦啦啦啦啦啦啦啦啦";
NSDictionary *attr = @{NSFontAttributeName:[UIFont systemFontOfSize:13],NSForegroundColorAttributeName:[UIColor yellowColor]};
[str drawInRect:CGRectMake(10, 10, 100, 100) withAttributes:attr];
}
