iOS开发核心动画之Quartz2D绘图

一. Quartz2D的绘制不同图形

1. 绘图步骤

1> 自定义一个View

2> 在- (void)drawrectangle方法中进行绘图

获取当前上下文

CGContextRef ref = UIGraphicsGetCurrentContext();

绘制路径

UIBezierPath *path = [UIBezierPath bezierPath];

保存路径到上下文种

CGContextAddPath(ref, path.CGPath);

将上下文中的内容渲染到view的layer上(描边:stroke 填充:fill)

CGContextStrokePath(ref);

2. 绘制直线

- (void)drawreLine
{
// 1.获取上下文
CGContextRef ref = UIGraphicsGetCurrentContext();
// 2.绘制路径
UIBezierPath *path = [UIBezierPath bezierPath];
// 2.1 设置起点
[path moveToPoint:CGPointMake(20, 250)];
// 2.2 设置线的终点
[path addLineToPoint:CGPointMake(100, 50)];
// 3.保存路径到上下文中
CGContextAddPath(ref, path.CGPath);
// 4.将上下文中的内容渲染到view上
CGContextStrokePath(ref);
}

3. 绘制矩形框

- (void)drawrectangle
{
// 1.获取上下文
CGContextRef ref = UIGraphicsGetCurrentContext();
// 2.绘制路径
UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 50, 60)];
// 3.保存路径到上下文
CGContextAddPath(ref, path.CGPath);
[[UIColor redColor] set];
// 4.上下文渲染到view上
CGContextStrokePath(ref);
}

4. 绘制圆

- (void)drawCirle
{
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 20, 50, 40) cornerRadius:20];
[path stroke];
}

5. 绘制圆弧

- (void)drawRect:(CGRect)rect {
CGPoint center = CGPointMake(self.bounds.size.width * 0.5, self.bounds.size.height * 0.5);
CGFloat radius = self.bounds.size.width * 0.5 - 10;
CGFloat startAngle = -M_PI_2;
CGFloat endAngle = startAngle + self.progress * M_PI * 2;
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
[path stroke];
}

6. 绘制饼型

- (void)drawRect:(CGRect)rect {
NSArray *dataArray = @[@25, @25, @50];
CGPoint center = CGPointMake(self.bounds.size.width * 0.5, self.bounds.size.height * 0.5);
CGFloat radius = self.bounds.size.width * 0.5 - 10;
CGFloat startA = 0;
CGFloat angle = 0;
CGFloat endA = 0;
for (NSNumber *num in dataArray) {
startA = endA;
angle = num.intValue / 100.0 * M_PI * 2;
endA = startA + angle;
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];
[[self randomColor] set];
[path addLineToPoint:center];
[path fill];
}
}
// 随机颜色
- (UIColor *)randomColor
{
CGFloat R = arc4random_uniform(256) / 255.0;
CGFloat G = arc4random_uniform(256) / 255.0;
CGFloat B = arc4random_uniform(256) / 255.0;
return [UIColor colorWithRed:R green:G blue:B alpha:1];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// 重绘
[self setNeedsDisplay];
}

二. Quartz2D的一些基本属性

1. 绘文字

- (void)drawRect:(CGRect)rect {
// Drawing code
//画文字,无论有没有看到上下文,只要是绘制东西到View上,就必须得要在drawRect方法当中进行.
NSString *str = @"adsfasffasdfasdfasdfa";
//withAttributes,设文字的属性.,文字大小,颜色,阴影,描边.x
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
//key,value,
dict[NSFontAttributeName] = [UIFont systemFontOfSize:50];
dict[NSForegroundColorAttributeName] = [UIColor redColor];
//设置阴影
NSShadow *shdow = [[NSShadow alloc] init];
shdow.shadowOffset = CGSizeMake(10, -10);
shdow.shadowColor = [UIColor greenColor];
shdow.shadowBlurRadius = 3;
dict[NSShadowAttributeName] = shdow;
//设置描边
dict[NSStrokeWidthAttributeName] = @2;
//设置描边颜色
dict[NSStrokeColorAttributeName] = [UIColor blueColor];
//drawAtPoint:不会自动换行
//drawInRect:会自动换行.
//画文字
[str drawAtPoint:CGPointZero withAttributes:dict];
[str drawInRect:rect withAttributes:dict];
}

2. 绘图片

- (void)drawRect:(CGRect)rect {
// Drawing code
//画图片.
//加载图片
UIImage *image = [UIImage imageNamed:@"001"];
//绘制图片是原图片的尺寸大小.
// [image drawAtPoint:CGPointZero];
//把整张图片填充到rect这个区域当中.
// [image drawInRect:rect];
// //平铺
[image drawAsPatternInRect:rect];
// //裁剪,超过裁剪区域的内容,都会被裁剪掉.,设置裁剪区域,必须得要在绘制图片之前.
// UIRectClip(CGRectMake(0, 0, 50, 50));
//
// [image drawAtPoint:CGPointZero];
//快速的填充一个矩形.
UIRectFill(CGRectMake(0, 100, 100, 100));
}

3. 雪花(定时器)

- (void)awakeFromNib
{
// 添加定时器
CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateImageY)];
[link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)updateImageY
{
_imageY += 10;
if (_imageY > self.bounds.size.height) {
_imageY = 0;
}
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect {
// 1.加载图片
UIImage *image = [UIImage imageNamed:@"雪花"];
[image drawAtPoint:CGPointMake(0, _imageY)];
}

4. 水印

// 1.水印
- (void)watermark
{
// 0.加载图片
UIImage *image = [UIImage imageNamed:@"小黄人"];
// 1.开启位图上下文
UIGraphicsBeginImageContext(image.size);
// 2.绘制图片
[image drawAtPoint:CGPointZero];
// 3.绘制文字
NSString *str = @"小码哥";
NSMutableDictionary *dictM = [NSMutableDictionary dictionary];
dictM[NSFontAttributeName] = [UIFont systemFontOfSize:50];
dictM[NSForegroundColorAttributeName] = [UIColor redColor];
[str drawAtPoint:CGPointZero withAttributes:dictM];
// 4.生成新的图片
image = UIGraphicsGetImageFromCurrentImageContext();
// 5.销毁位图上下文
UIGraphicsEndImageContext();
self.watermarkImageView.image = image;
}

5. 截取圆形图片

// 2.截取圆形图片
- (void)circle
{
// 0.加载图片
UIImage *image = [UIImage imageNamed:@"阿狸头像"];
// 1.开启位图上下文
UIGraphicsBeginImageContext(image.size);
// 2.设置裁剪区域
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
[path addClip];
// 3.绘制图片
[image drawAtPoint:CGPointZero];
// 4.生成新的图片
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.circleImageView.image = image;
}

6.截取带有边框的圆形图片

// 3.截取有边框的圆形图片
- (void)borderCircle
{
// 截取带有边框的圆形图片
CGFloat border = 10;
// 0.加载图片
UIImage *image = [UIImage imageNamed:@"阿狸头像"];
// 1.开启位图上下文
CGSize bitmapSize = CGSizeMake(image.size.width + border * 2, image.size.height + border * 2);
UIGraphicsBeginImageContext(bitmapSize);
// 2.绘制大的圆形
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, bitmapSize.width, bitmapSize.height)];
[[UIColor redColor] set];
[path fill];
// 3.设置小圆裁剪区域
path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(border, border, image.size.width, image.size.height)];
[path addClip];
// 4.绘制图片
[image drawAtPoint:CGPointMake(border, border)];
// 5.生成新的图片
image = UIGraphicsGetImageFromCurrentImageContext();
// 6.关闭位图上下文
UIGraphicsEndImageContext();
self.circleImageView.image = image;
}

7. 截屏

// 截屏
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// 1.开启位图上下文
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0);
// 2.获取位图上下文
CGContextRef crf = UIGraphicsGetCurrentContext();
// 3.将屏幕view的layer渲染到路径中
[self.view.layer renderInContext:crf];
// 4.获取位图上下文中的内容
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
// 5.关闭位图上下文
UIGraphicsEndImageContext();
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:@"/Users/admin/Desktop/image.png" atomically:YES];
}

8. 移动鼠标确定截取屏幕的大小

1> 定义一个手势

- (void)pan:(UIPanGestureRecognizer *)pan
{
CGPoint curP = [pan locationInView:self.huoyingImageView];
if (pan.state == UIGestureRecognizerStateBegan) { // 开始拖动
self.startP = curP;
} else if (pan.state == UIGestureRecognizerStateChanged) { // 拖动中
CGFloat coverVX = self.startP.x;
CGFloat coverVY = self.startP.y;
CGFloat coverVW = curP.x - self.startP.x;
CGFloat coverVH = curP.y - self.startP.y;
CGRect frame = CGRectMake(coverVX, coverVY, coverVW, coverVH);
self.coverV.frame = frame;
} else if (pan.state == UIGestureRecognizerStateEnded) { // 结束拖动
// 1.开启位图上下文
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0);
// 2.设置裁剪区域
UIBezierPath *path = [UIBezierPath bezierPathWithRect:self.coverV.frame];
[path addClip];
// 3.获取当前位图上下文
CGContextRef ref = UIGraphicsGetCurrentContext();
// 4.将图片的layer渲染到上下文
[self.huoyingImageView.layer renderInContext:ref];
// 5.生成一张新的图片并赋值给huoyingImageView
self.huoyingImageView.image = UIGraphicsGetImageFromCurrentImageContext();
// 6.关闭位图上下文
UIGraphicsEndImageContext();
// 7.移除遮盖
[self.coverV removeFromSuperview];
}
}

2> 设置遮盖View

#pragma mark - View懒加载
- (UIView *)coverV
{
if (!_coverV) {
UIView *coverV = [[UIView alloc] init];
coverV.backgroundColor = [UIColor blackColor];
coverV.alpha = 0.7;
[self.view addSubview:coverV];
self.coverV = coverV;
}
return _coverV;
}

9. 撕图效果

设置清除区域 CGContextClearRect(ref, rect);

- (void)pan:(UIPanGestureRecognizer *)pan
{
CGPoint curP = [pan locationInView:self.imageView];
// 1.开启位图上下文
UIGraphicsBeginImageContextWithOptions(self.imageView.bounds.size, NO, 0);
// 2.获取当前位图上下文
CGContextRef ref = UIGraphicsGetCurrentContext();
// 3.将图片渲染到位图上下文种
[self.imageView.layer renderInContext:ref];
// 4.设置清除区域
CGFloat WH = 30;
CGFloat X = curP.x - WH * 0.5;
CGFloat Y = curP.y - WH * 0.5;
CGRect rect = CGRectMake(X, Y, WH, WH);
CGContextClearRect(ref, rect);
// 5.获取位图上下文种的图片并赋值给imageView
self.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
// 6.关闭位图上下文
UIGraphicsEndImageContext();
}

转载于:https://www.cnblogs.com/Xfsrn/p/5000340.html

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