绘制图形-移动,旋转,阴影,渐变

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

UIBezierPath *path = [UIBezierPath
bezierPath];

//绘图的起点坐标

[path moveToPoint:CGPointMake(50,
50)];

//依次连接各个坐标

[path addLineToPoint:CGPointMake(50,
100)];

[path addLineToPoint:CGPointMake(100,
100)];

[path addLineToPoint:CGPointMake(100,
50)];

//闭合

[path
closePath];

//上下文

CGContextRef context =
UIGraphicsGetCurrentContext();

//保存上下文状态

CGContextSaveGState(context);

//绘制图形轮廓

[path
stroke];

//移动原点，使各个坐标依次移动

CGContextTranslateCTM(context,
50,
50);

//设置颜色

UIColor *fillColor = [UIColor
greenColor];

//填充颜色

[fillColor
setFill];

//填充

[path
fill];

//再次移动原点坐标

CGContextTranslateCTM(context,
50,
50);

//图形旋转

CGContextRotateCTM(context,
3.14/4);

fillColor = [UIColor
orangeColor];

[path
fill];

//[path stroke];

//恢复上下文状态,

CGContextRestoreGState(context);

CGContextSaveGState(context);

CGContextTranslateCTM(context,
50,
200);

//图形阴影

CGContextSetShadow(context,
CGSizeMake(10,
10),
7);

fillColor = [UIColor
grayColor];

[fillColor
setFill];

[path
fill];

CGContextRestoreGState(context);//恢复上下文状态

CGContextSaveGState(context);//保存上下文状态

CGContextTranslateCTM(context,
50,
300);

//定义渐变

CGGradientRef myGradient;

//声明色彩空间

CGColorSpaceRef colorSpace =
CGColorSpaceCreateDeviceRGB();

CGFloat components[8] = {1.0,
0.0,
0.0, 1.0,

0.0,
0.0, 1.0,
1.0

};

CGFloat locations[2] = {0.2,
0.8};

int num =
2;

myGradient =
CGGradientCreateWithColorComponents(colorSpace, components, locations, num);

[path
addClip];

CGContextDrawLinearGradient(context, myGradient,
CGPointMake(0,
0),
CGPointMake(100,
0),
0);

CGColorSpaceRelease(colorSpace);

CGGradientRelease(myGradient);

CGContextRestoreGState(context);

}

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