旋转后改变棋盘颜色

Question

我是 Obj-C 的新手。我有以下棋盘：

for (int row = 0; row < 8; row++) {
    for (int column = 0; column < 8; column++) {

        CGRect square = {horizontalOffSet + (column * squareSize),
                         verticalOffSet + (row * squareSize),
                         squareSize, squareSize};
        UIView *rect = [[UIView alloc] initWithFrame:square];
        rect.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;

        horizontalOffSet = horizontalOffSet + squareSize;
        if ((row + column) % 2 == 0) {
            //verticalOffSet = verticalOffSet + squareSize;
            horizontalOffSet = 0;
            rect.backgroundColor = [UIColor whiteColor];
            [anotherRect addSubview:rect];
        } else {
            //verticalOffSet = verticalOffSet + squareSize;
            horizontalOffSet = 0;
            rect.backgroundColor = [UIColor blackColor];
            [anotherRect addSubview:rect];
        }
    }
}

我的任务是在旋转时更改字段的颜色，例如，在向左旋转时用青色和紫色填充它。不太清楚怎么做。

Answer 1

@somerk 检查我更新的代码：

1) 我已将标识符 (tag) 指定为已识别的国际象棋视图，其中白色和黑色。你可以在没有标识符的情况下做到这一点，但如果有多个 subviews 标识符是更好的获取方式。

 int horizontalOffSet = 2;
    int squareSize = 40;
    int verticalOffSet = 2;

    for (int row = 0; row < 8; row++) {
        for (int column = 0; column < 8; column++) {

            CGRect square = {horizontalOffSet + (column * squareSize),
                verticalOffSet + (row * squareSize),
                squareSize, squareSize};
            UIView *rect = [[UIView alloc] initWithFrame:square];
            rect.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;

            horizontalOffSet = horizontalOffSet + squareSize;
            if ((row + column) % 2 == 0) {
                //verticalOffSet = verticalOffSet + squareSize;
                horizontalOffSet = 0;
                rect.tag = 101;
                rect.backgroundColor = [UIColor whiteColor];
                [self.view addSubview:rect];
            } else {
                //verticalOffSet = verticalOffSet + squareSize;
                rect.tag = 102;
                horizontalOffSet = 0;
                rect.backgroundColor = [UIColor blackColor];
                [self.view addSubview:rect];
            }
        }

2) 我在 UIButton 单击时执行了颜色更改事件，因此您必须在旋转事件后使用该代码。

-(IBAction)changeColor:(UIButton *)btn{
    for(UIView *rectViews in self.view.subviews){
        UIColor *clrblck = [UIColor blackColor];
        if(rectViews.backgroundColor == clrblck && rectViews.tag == 102){
            rectViews.backgroundColor = [UIColor cyanColor];
        }else if(rectViews.backgroundColor == clrblck && rectViews.tag == 101){
            rectViews.backgroundColor = [UIColor purpleColor];
        }else{
             // you will get other views here..
        }
    }
}

我已获取所有子视图并检查 backgroundColor 和 tag 并更改其 backgroundColor。

注意：根据您在 loop 中的视图名称以及您在 anotherRect 中将 rect 添加为 subviews 的位置更改视图名称。

有什么问题可以随时问我。快乐编码:)

Answer 2

找到另一种可能的改变颜色的解决方案：

-(void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {

[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

CGFloat rndmColor1 = (float)(arc4random() % 256) / 255;
CGFloat rndmColor2 = (float)(arc4random() % 256) / 255;


for(UIView *rect in self.chessField.subviews){
    if (rect.tag == 102) {
        rect.backgroundColor = [UIColor colorWithHue:rndmColor1 saturation:1 brightness:1 alpha:1];
    } else if (rect.tag == 101) {
        rect.backgroundColor = [UIColor colorWithHue:rndmColor2 saturation:1 brightness:1 alpha:1];
    }
}

}

旋转后改变棋盘颜色

Change color of chess field after rotate

objective-c

subview

nsarray

ios