• 变形


    变形 (transform):
    什么是变形
    视图发生了 位移, 缩放, 旋转这样的变化叫做变形

    如何实现视图的变形
    通过修改视图对象 transform属性就能完成变形

    transform属性
    ** 类型** CGAffineTransform (结构体类型)
    ** 修改transform**
    1、translation 位移
    2、scale 缩放
    3、rotation 旋转
    4、CGAffineTransformMakeTranslation //位移变化,变形是基于变形前的那个基础状态

    CGAffineTransformTranslate
    CGAffineTransformMakeScale
    CGAffineTransformScale
    CGAffineTransformMakeRotation
    CGAffineTransformRotate

    清除视图的所有变形
    CGAffineTransformIdentity

    -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    //位移变化
    //CGAffineTransformMakeTranslation 变形是基于变形前的那个基础状态
    // self.imageView.transform = CGAffineTransformMakeTranslation(50, 50);
    //变形是在 当前 变形基础上 继续变形
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, 50, 50);

    //缩放变形
    

    // self.imageView.transform = CGAffineTransformMakeScale(1.1, 1.5);
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, 1.02, 1.02);

    //旋转变化
    

    // self.imageView.transform = CGAffineTransformMakeRotation(M_PI_4);
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, M_PI_4);//45度

    NSLog(@"transform %@",NSStringFromCGAffineTransform(self.imageView.transform));
    

    }

    bounds:
    @interface ViewController ()
    @property (weak, nonatomic) IBOutlet UIImageView *imageView;
    @end

    @implementation ViewController

    //手势代理方法 返回YES是可以同时触发
    -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
    }

    • (void)viewDidLoad {
      [super viewDidLoad];
      //拖拽
      UIPanGestureRecognizer *panGR = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGR:)];
      self.imageView.userInteractionEnabled = YES;
      [self.view addGestureRecognizer:panGR];
      //捏合
      UIPinchGestureRecognizer *pinchGR = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGR:)];
      pinchGR.delegate = self;
      [self.view addGestureRecognizer:pinchGR];
      //旋转
      UIRotationGestureRecognizer *rotationGR = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGR:)];
      rotationGR.delegate = self;
      [self.view addGestureRecognizer:rotationGR];
      //点击
      UITapGestureRecognizer *tapGR = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGR:)];
      [self.view addGestureRecognizer:tapGR];

    }

    -(void)tapGR:(UITapGestureRecognizer*)gr {
    self.imageView.transform = CGAffineTransformIdentity;
    }

    -(void)rotationGR:(UIRotationGestureRecognizer*)gr {
    CGFloat rotation = gr.rotation;
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation);
    gr.rotation = 0;
    }

    -(void)pinchGR:(UIPinchGestureRecognizer*)gr {
    CGFloat scale = gr.scale;
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, scale, scale);
    gr.scale = 1;
    }

    -(void)panGR:(UIPanGestureRecognizer*)gr {
    // CGPoint translation = [gr translationInView:self.view];
    // CGPoint center = self.imageView.center;
    // center.x += translation.x;
    // center.y += translation.y;
    // self.imageView.center = center;
    // [gr setTranslation:CGPointZero inView:self.view];

    CGPoint translation = [gr translationInView:self.view];
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, translation.x, translation.y);
    [gr setTranslation:CGPointZero inView:self.view];
    

    }

    深入坐标系:

    • (void)viewDidLoad {
      [super viewDidLoad];
      [self printInfo];
      NSLog(@"============================");
      [self changeTransform];
      }
      -(void)printInfo{
      NSLog(@" frame:%@ bounds:%@ center:%@ transform:%@ ",
      NSStringFromCGRect(self.myView.frame),
      NSStringFromCGRect(self.myView.bounds),
      NSStringFromCGPoint(self.myView.center),
      NSStringFromCGAffineTransform(self.myView.transform)
      );
      }
      -(void)changeFrame {
      CGRect frame = self.myView.frame;
      frame.origin.x += 10;
      frame.origin.y += 10;
      frame.size.width += 100;
      frame.size.height += 100;
      self.myView.frame = frame;
      [self printInfo];
      }
      -(void)changeBounds {
      CGRect bounds = self.myView.bounds;
      // bounds.origin.x += 10;
      // bounds.origin.y += 10;
      bounds.size.width += 100;
      bounds.size.height += 100;
      self.myView.bounds = bounds;
      [self printInfo];
      }

    -(void)changeCenter {
    CGPoint center = self.myView.center;
    center.x += 100;
    center.y += 100;
    self.myView.center = center;
    [self printInfo];
    }

    成功的三大原则: 1、坚持 2、不要脸 3、坚持不要脸
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  • 原文地址:https://www.cnblogs.com/xulinmei/p/7420183.html
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