实现与效果
- 微调角度
- 90°角旋转
- 改变宽高比例
- 旋转和微调过程中适应边框填充边界
- 源码
微调角度
微调角度操作
- (void)beginTrackingWithTouch {
// 开始微调角度
}
- (void)continueTrackingWithTouch:(CGFloat)value changeValue:(CGFloat)changeValue {
// 调整中
[self.imageCropperView setRotationAngle:changeValue];
}
- (void)endTrackingWithTouch {
// 微调角度结束
}
90°角旋转
90°角旋转操作
- (void)rotate:(id)sender {
[self.imageCropperView rotation:YES];
}
改变宽高比例
改变宽高比例操作
- (void)resizeWHScale:(id)sender {
[UIView animateWithDuration:0.15 animations:^{
self.imageCropperView.frame = [self imageCropViewFrame:self.currType];
[self.imageCropperView setResizeWHRatio:self.currScale animated:NO];
}completion:nil];
其他可设置属性
/** 裁剪框颜色 / Mask layer color */
**@property (nonatomic, strong) UIColor *maskColor;
/** 裁剪框阴影 / Mask frame color */
**@property (nonatomic, strong) UIColor *shadowColor;
/** 网格线颜色 / Gridlines color */
**@property (nonatomic, strong) UIColor *shapeLayerColor;
/** 是否允许双指自由旋转 / Allow two fingers to rotate freely ,default value is YES */
**@property (nonatomic, assign, getter=isRotationEnabled) BOOL rotationEnabled;
/** 是否允许双击重置 / Allow double click Reset , default value is YES */
**@property (nonatomic, assign, getter=isDoubleResetEnabled) BOOL doubleResetEnabled;
/** 是否为顺势转旋转 / Is it clockwise rotation , default value is NO */
**@property (nonatomic, assign, getter=isClockwiseRotation) BOOL clockwiseRotation;
/** 重置 / reset */
- (void)reset:(BOOL)animated;
/** 设置【裁剪比例】 / Setup the cut scale */
**@property (nonatomic, assign) CGSize resizeWHRatio;
- (void)setResizeWHRatio:(CGSize)resizeWHRatio;
- (void)setResizeWHRatio:(CGSize)resizeWHRatio animated:(BOOL)animated;
/** 设置【旋转角度】/ Setup the rotation angle */
@property (nonatomic, assign) CGFloat rotationAngle;
- (void)rotation:(BOOL)animated;
- (void)setRotationAngle:(CGFloat)rotationAngle;
- (void)setRotationAngle:(CGFloat)rotationAngle animated:(BOOL)animated;
关于旋转和微调过程中适应边框填充边界的计算方式
旋转过程中，为防止漏出黑色背景区域，需要在调整过程中对 scrollview 进行缩放，以满足图片充满裁剪区域，计算方式如下：
地铁上写的计算方法，粗糙
即：
scrollview.width = CGRectGetWidth(maskRect) * cos(a) + CGRectGetHeight(maskRect) * sin(a);
scrollview.height = CGRectGetHeight(maskRect) * cos(a) + CGRectGetWidth(maskRect) * sin(a);
源码
有兴趣的可以下载看下，希望大佬多多点星。
