iOS为图像添加拉直效果

Question

在我的iOS项目中，我正在使用CLImageEditor。我必须添加拉直效果。任何人都可以帮助我如何制作＆＃34;拉直＆＃34;实现

Answer 1

添加QuartzCore.framework

#import <QuartzCore/QuartzCore.h>

以下是旋转，透视和缩放的一些基本代码。

CALayer *layer = myView.layer;
CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;

// Rotate
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, rotate, 0.0f, 0.0f, 1.0f);

// Perspective
// mysterious multiplier m34
//    m34 = -1.0 / 500, 500 being somewhat the size of the view
rotationAndPerspectiveTransform.m34 = .02;

rotationAndPerspectiveTransform = CATransform3DTranslate(rotationAndPerspectiveTransform, 0.0f , 0.0f, translate);

// Scale
rotationAndPerspectiveTransform = CATransform3DScale(rotationAndPerspectiveTransform, scale, scale, 1.0f);

layer.transform = rotationAndPerspectiveTransform;