iPhone 4G 的 uiview 调整大小和操作问题
我编写了一个用于裁剪目的的代码。场景是这样的,它有 4 个 uiviews
1) Top
2) 左
3) 右
4) 底部
每个 uiview 都会根据所需的更改调整大小,主 uiview 有一个包含图像的 uiimageview。当我在 iPhone 3、3GS、iPad 2、iPad 4 上运行代码时,它工作正常,但当我在 iPhone 4G 上运行它时,它会产生非常不想要的结果。我知道我的代码计算很好,这就是为什么它们在除 iPhone 4G 之外的所有设备上都能正常工作。 会出现什么问题呢?有什么想法吗? iPhone 4 的 uiview 计算是否不同还是有其他原因?
<代码>
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
// messageLabel.text = @"Drag Detected";
commonCropT = leftRect.frame.origin.y; // left.y or Right.y or Top.H is same thing
commonCropB = lowerRect.frame.origin.y;// left.H or Right.H or lower.y is same thing
commonCropL = leftRect.frame.size.width; //
commonCropR = rightRect.frame.origin.x;//
commonCropH = leftRect.frame.size.height;// left.width and right.width
leftYT = leftRect.frame.origin.y;
leftH = leftRect.frame.size.height;
leftYB = leftYT + leftH;
leftW = leftRect.frame.size.width; // leftXR
rightXL = rightRect.frame.origin.x;
rightW = rightRect.frame.size.width;
rightXR = rightXL + rightW;
rightYT = rightRect.frame.origin.y;
rightH = rightRect.frame.size.height;
rightYB = rightH + rightYT;
if (isTappedOnUpperLeftCorner)
{
if (commonCropR - movedPoint.x <= kWidthDifference)
return;
if (movedPoint.y < commonCropT )
{
commonCropH = commonCropH + (commonCropT - movedPoint.y);
}
else if (movedPoint.y > commonCropT )
{
if (commonCropB - movedPoint.y <= kHeightDifference ) {
return;
}
commonCropH = commonCropH - (movedPoint.y - commonCropT);
}
commonCropL = movedPoint.x;
commonCropT = movedPoint.y;
NSLog(@" cropW = %d ",cropW);
[upperRect setFrame:CGRectMake(upperRect.frame.origin.x, upperRect.frame.origin.y, upperRect.frame.size.width, commonCropT)];
[leftRect setFrame:CGRectMake(leftRect.frame.origin.x, commonCropT, commonCropL, commonCropH)];
[rightRect setFrame:CGRectMake(commonCropR, commonCropT, rightRect.frame.size.width, commonCropH)];
}
}
I have written a code that I use for cropping purpose. The scenario is like, It has 4 uiviews
1) Top
2) Left
3) Right
4) Bottom
Each uiview is resized according to the desired change and the main uiview has a uiimageview which contains an image. when I run the code on iPhone 3, 3GS, iPad 2, iPad 4 it works fine but when i run it on iPhone 4G, it generates very undesired result. I know my code calculations are fine thats why they are working fine on every device except the iPhone 4G.
What will the issue be ? Any ideas ? Is uiview calculations are different for iPhone 4 or any other reason ?
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { // messageLabel.text = @"Drag Detected";commonCropT = leftRect.frame.origin.y; // left.y or Right.y or Top.H is same thing commonCropB = lowerRect.frame.origin.y;// left.H or Right.H or lower.y is same thing commonCropL = leftRect.frame.size.width; // commonCropR = rightRect.frame.origin.x;// commonCropH = leftRect.frame.size.height;// left.width and right.width leftYT = leftRect.frame.origin.y; leftH = leftRect.frame.size.height; leftYB = leftYT + leftH; leftW = leftRect.frame.size.width; // leftXR rightXL = rightRect.frame.origin.x; rightW = rightRect.frame.size.width; rightXR = rightXL + rightW; rightYT = rightRect.frame.origin.y; rightH = rightRect.frame.size.height; rightYB = rightH + rightYT; if (isTappedOnUpperLeftCorner) { if (commonCropR - movedPoint.x <= kWidthDifference) return; if (movedPoint.y < commonCropT ) { commonCropH = commonCropH + (commonCropT - movedPoint.y); } else if (movedPoint.y > commonCropT ) { if (commonCropB - movedPoint.y <= kHeightDifference ) { return; } commonCropH = commonCropH - (movedPoint.y - commonCropT); } commonCropL = movedPoint.x; commonCropT = movedPoint.y; NSLog(@" cropW = %d ",cropW); [upperRect setFrame:CGRectMake(upperRect.frame.origin.x, upperRect.frame.origin.y, upperRect.frame.size.width, commonCropT)]; [leftRect setFrame:CGRectMake(leftRect.frame.origin.x, commonCropT, commonCropL, commonCropH)]; [rightRect setFrame:CGRectMake(commonCropR, commonCropT, rightRect.frame.size.width, commonCropH)]; }
}
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我相信您遇到的问题与我遇到的问题类似。对于视网膜显示器,触摸坐标可能是非整数,例如 23.5。如果您在视图框架中使用非整数值,您可能会遇到这种行为。看来 UIView 不支持非整数值。
在计算中的某个时刻使用 roundf() 或类似的函数可以避免此问题。
I believe the problem you're running into is similar to a problem I'm seeing. With the retina display the touch coordinates may be non-integral, e.g. 23.5. If you use non-integral value with the frame of a view you may run into this kind of behavior. It appears that UIView doesn't support non-integral values.
Use roundf() or a similar function at some point in your calculations to avoid this problem.