怎么獲取view在父類中的frame, 或者說 父類UIView中SubView的坐標(biāo)怎么轉(zhuǎn)換成在父類UIView中的坐標(biāo)
// 將像素point由point所在視圖轉(zhuǎn)換到目標(biāo)視圖view中,返回在目標(biāo)視圖view中的像素值
- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;
// 將像素point從view中轉(zhuǎn)換到當(dāng)前視圖中,返回在當(dāng)前視圖中的像素值
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;
// 將rect由rect所在視圖轉(zhuǎn)換到目標(biāo)視圖view中,返回在目標(biāo)視圖view中的rect
- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;
// 將rect從view中轉(zhuǎn)換到當(dāng)前視圖中,返回在當(dāng)前視圖中的rect
- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;
例把UITableViewCell中的subview(btn)的frame轉(zhuǎn)換到 controllerA中
// controllerA 中有一個UITableView, UITableView里有多行UITableVieCell,cell上放有一個button
// 在controllerA中實現(xiàn):
CGRect rc = [cell convertRect:cell.btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:cell.btn.frame fromView:cell];
// 此rc為btn在controllerA中的rect
或當(dāng)已知btn時:
CGRect rc = [btn.superview convertRect:btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:btn.frame fromView:btn.superview];
子控件位置轉(zhuǎn)換成父控件的位置
CGRect focusFrame = [_scrollView convertRect:_joinView.frametoView:self.view];
這里_scrollView是self.view的子控件
_joinView是_scrollView的子控件,這里是計算出_joinView在self.view的位置,
當(dāng)然還有其他類似的方法
[view convertPoint:<#(CGPoint)#> fromView:<#(UIView *)#>]
[view convertPoint:<#(CGPoint)#> toView:<#(UIView *)#>]
[self.view convertRect:<#(CGRect)#> fromView:<#(UIView *)#>]
[self.view convertRect:<#(CGRect)#> toView:<#(UIView *)#>]
2.同一坐標(biāo)系的比較
判斷 rect1是否包含 rect2,返回bool
BOOL isContain = CGRectContainsRect(rect1, rect2);
判斷 rect1和 rect2是否有重疊,返回bool
BOOL isIntersect = CGRectIntersectsRect(rect1, rect2);
判斷點point是否在rect中,返回bool
BOOL isContain = CGRectContainsPoint(rect, point);
實例1:判斷UIView控件是否在主窗口上
方法寫在UIView的Category中
- (BOOL)isShowingOnKeyWindow {
//主窗口
UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
//以主窗口左上角為坐標(biāo)原點,計算self的矩形框
CGRect newFrame = [keyWindow convertRect:self.bounds fromView:self];
CGRect winBounds = keyWindow.bounds;
//主窗口的bounds 和 self的矩形框 是否有重疊
BOOL intersects = CGRectIntersectsRect(newFrame, winBounds);
return !self.isHidden && self.alpha > 0.01 && self.window == keyWindow && intersects;
}
實例2:判斷兩個View是否有重疊
方法寫在UIView的Category中
- (BOOL)intersectWithView:(UIView *)view {
//主窗口
UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
//以主窗口左上角為坐標(biāo)原點,計算self和view的矩形框
CGRect selfRect = [self convertRect:self.bounds toView:keyWindow];
CGRect viewRect = [view convertRect:view.bounds toView:keyWindow];
//返回是否有重疊的結(jié)果
return CGRectIntersectsRect(selfRect, viewRect);
}