将macOS drawRect转换为iOS

Question

这是Mac的代码。我想把它们转换成iOS。

- (void)drawRect:(NSRect)rect {
    NSGraphicsContext *gc = [NSGraphicsContext currentContext];
    [gc setShouldAntialias:YES];

    NSAffineTransform *trans;

    if ([NSGraphicsContext currentContextDrawingToScreen]) {
        trans = [NSAffineTransform transform];
        [trans scaleXBy:zoom yBy:zoom];
        [trans concat];
    }

    if ([NSGraphicsContext currentContextDrawingToScreen]) {
        trans = [NSAffineTransform transform];
        [trans translateXBy:0 yBy:10.0];
        [trans concat];
    }
}

NSAffineTransform如何转换为CGAffineTransform

谢谢你的帮助~

Answer 1

您可以使用CGAffineTransform。

CGAffineTransform trans = CGAffineTransformIdentity; // identity transfrom
CGAffineTransformScale(trans, 1.0/zoom, 1.0/zoom); // scale