CGAffineTransformMakeRotation旋转图像

最新推荐文章于 2016-11-26 20:51:25 发布

原创最新推荐文章于 2016-11-26 20:51:25 发布 · 644 阅读

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本文介绍如何使用Objective-C在不同的位置添加UIImage并进行旋转操作，包括左上、左下、右下及右上的布局方式，并提供了具体的代码实现。

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UIImage *image = [UIImageimageNamed:@"addcamera_scanning_area.png"];

UIImageView *imageView = [ [ UIImageView alloc ] initWithFrame:CGRectMake((MAINSCREEN_WIDTH - scanRectWidth)/2.0,EXTRA_HEADER_HEIGHT, imageWidth, imageHeight)];//左上

imageView.image = image;

[self.viewaddSubview:imageView];

[imageViewrelease];

imageView = [ [UIImageView alloc ] initWithFrame:CGRectMake((MAINSCREEN_WIDTH - scanRectWidth)/2.0,MAINSCREEN_HEIGHT - imageHeight, imageWidth, imageHeight)];//左下

imageView.image = image;

[self.viewaddSubview:imageView];

[imageViewrelease];

// 旋转

CGAffineTransform rotate =CGAffineTransformMakeRotation( 270.0 /180.0 * M_PI );

[imageViewsetTransform:rotate];

imageView = [ [UIImageView alloc ] initWithFrame:CGRectMake((MAINSCREEN_WIDTH - scanRectWidth)/2.0 + scanRectWidth - imageWidth, MAINSCREEN_HEIGHT - imageHeight, imageWidth, imageHeight)];//右下

imageView.image = image;

[self.viewaddSubview:imageView];

[imageViewrelease];

// 旋转

rotate = CGAffineTransformMakeRotation(M_PI );

[imageViewsetTransform:rotate];

imageView = [ [UIImageView alloc ] initWithFrame:CGRectMake((MAINSCREEN_WIDTH - scanRectWidth)/2.0 + scanRectWidth - imageWidth, EXTRA_HEADER_HEIGHT, imageWidth, imageHeight)];//右上

imageView.image = image;

[self.viewaddSubview:imageView];

[imageViewrelease];

// 旋转

rotate = CGAffineTransformMakeRotation(90.0 / 180.0 * M_PI );

[imageViewsetTransform:rotate];