Io 根据UIImageView中的图像查找触摸位置
我在UIImageView中有一个图像,UIImageView的内容模式设置为UIViewContentModeScaleAspectFit。那么如何根据图像找到触摸位置呢。请记住,我的图像大小分辨率很高,比如2000 x 3000。试试这段代码。我没有测试它,所以可能会出错。我希望这些评论能够帮助您找到正确的解决方案Io 根据UIImageView中的图像查找触摸位置,io,uiimageview,uiimage,Io,Uiimageview,Uiimage,我在UIImageView中有一个图像,UIImageView的内容模式设置为UIViewContentModeScaleAspectFit。那么如何根据图像找到触摸位置呢。请记住,我的图像大小分辨率很高,比如2000 x 3000。试试这段代码。我没有测试它,所以可能会出错。我希望这些评论能够帮助您找到正确的解决方案 - (CGPoint)point:(CGPoint)point onImageWithSize:(CGSize)imageSize inImageView:(UIImageVie
- (CGPoint)point:(CGPoint)point onImageWithSize:(CGSize)imageSize inImageView:(UIImageView *)view contentMode:(UIViewContentMode)mode
{
// find the relative image position on the view
CGPoint imageRelativeOrigin = CGPointZero;
CGSize imageRelativeSize = view.frame.size;
if(mode == UIViewContentModeScaleAspectFit)
{
// we expect one of the origin coordinates has a positive offset
// compare the ratio
if(imageSize.width/imageSize.height > view.frame.size.width/view.frame.size.height)
{
// in this case the image width is the same as the view width but height is smaller
imageRelativeSize = CGSizeMake(view.frame.size.width, view.frame.size.width*(imageSize.height/imageSize.width));
CGFloat verticalOffset = (view.frame.size.height-imageRelativeSize.height)*.5f; // this is the visible image offset
imageRelativeOrigin = CGPointMake(.0f, verticalOffset);
}
else
{
// in this case the image height is the same as the view height but widh is smaller
imageRelativeSize = CGSizeMake(view.frame.size.height*(imageSize.width/imageSize.height), view.frame.size.height);
CGFloat horizontalOffset = (view.frame.size.width-imageRelativeSize.width)*.5f; // this is the visible image offset
imageRelativeOrigin = CGPointMake(horizontalOffset, .0f);
}
}
else
{
// TODO: add other content modes
}
CGPoint relativeImagePoint = CGPointMake(point.x-imageRelativeOrigin.x, point.y-imageRelativeOrigin.y); // note these can now be off the image bounds
// resize to image coordinate system
CGPoint actualImagePoint = CGPointMake(relativeImagePoint.x*(imageSize.width/imageRelativeSize.width),
relativeImagePoint.y*(imageSize.height/imageRelativeSize.height));
return actualImagePoint;
}
这将处理所有内容模式。如果您需要知道它是否包含在您的图像中,只需将坐标与图像的大小进行比较,当然,如果是正值
+ (CGPoint) positionInImageView:(UIImageView *)imageView position:(CGPoint)position {
float widthScale = imageView.image.size.width / imageView.bounds.size.width;
float heightScale = imageView.image.size.height / imageView.bounds.size.height;
int xOffset = 0;
int yOffset = 0;
if (imageView.contentMode == UIViewContentModeScaleToFill) {
return CGPointMake(position.x * widthScale, position.y * heightScale);
}
else if (imageView.contentMode == UIViewContentModeScaleAspectFit || imageView.contentMode == UIViewContentModeScaleAspectFill) {
float scale = 1.0;
if ((widthScale > heightScale && imageView.contentMode == UIViewContentModeScaleAspectFit)
|| (widthScale < heightScale && imageView.contentMode == UIViewContentModeScaleAspectFill)) {
scale = widthScale;
yOffset = (imageView.image.size.height / heightScale - imageView.image.size.height / scale) / -2.0f;
} else {
scale = heightScale;
xOffset = (imageView.image.size.width / widthScale - imageView.image.size.width / scale) / -2.0f;
}
return CGPointMake((position.x + xOffset) * scale,
(position.y + yOffset) * scale);
} else {
float widthDifference = imageView.image.size.width - imageView.bounds.size.width;
float heightDifference = imageView.image.size.height - imageView.bounds.size.height;
if (imageView.contentMode == UIViewContentModeTop
|| imageView.contentMode == UIViewContentModeBottom
|| imageView.contentMode == UIViewContentModeCenter){
xOffset = widthDifference / 2.0f;
} else if (imageView.contentMode == UIViewContentModeRight
|| imageView.contentMode == UIViewContentModeTopRight
|| imageView.contentMode == UIViewContentModeBottomRight){
xOffset = widthDifference;
}
if (imageView.contentMode == UIViewContentModeCenter
|| imageView.contentMode == UIViewContentModeLeft
|| imageView.contentMode == UIViewContentModeRight){
yOffset = heightDifference / 2.0f;
} else if (imageView.contentMode == UIViewContentModeBottom
|| imageView.contentMode == UIViewContentModeBottomLeft
|| imageView.contentMode == UIViewContentModeBottomRight){
yOffset = heightDifference;
}
return CGPointMake(position.x + xOffset, position.y + yOffset);
}
}
+(CGPoint)位置图像视图:(UIImageView*)图像视图位置:(CGPoint)位置{
浮动宽度比例=imageView.image.size.width/imageView.bounds.size.width;
浮动高度比例=imageView.image.size.height/imageView.bounds.size.height;
int xOffset=0;
int-yOffset=0;
如果(imageView.contentMode==UIViewContentModeScaleToFill){
返回CGPointMake(位置.x*宽度刻度,位置.y*高度刻度);
}
else if(imageView.contentMode==UIViewContentModeScaleSpectFit | | imageView.contentMode==UIViewContentModeScaleSpectFill){
浮标度=1.0;
如果((widthScale>heightScale&&imageView.contentMode==UIViewContentModeScaleAspectFit)
||(widthScale
@MaticOblak Anysuggestions@mclin任何建议我收到内存警告。实际上,图像是高分辨率的。如果我不放大,它会在绘制4或5行后发出内存警告,然后应用程序崩溃。但如果图像放大,则其工作正常。。。为什么会这样?如果它与图像大小有关,那么当图像放大时,为什么它不提供内存警告和崩溃?我想我有下面所有模式的正确解决方案