Question

我曾多次问我。下面举一个例子:

 if (animated) {
    [UIView animateWithDuration:0.3 animations:^{            
        view.frame = newFrame;
    } completion:^(BOOL finished) {

        // same code as below
        SEL selector = @selector(sidePanelWillStartMoving:);
        if ([currentPanningVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
            [currentPanningVC respondsToSelector:selector]) {
            [(id)self.currentPanningVC sidePanelWillStartMoving:self.currentPanningVC];
        }

        if ([centerVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
            [centerVC respondsToSelector:selector]) {
            [(id)centerVC sidePanelWillStartMoving:self.currentPanningVC];
        }
    }];
}
else {
    view.frame = newFrame;

    // same code as before
    SEL selector = @selector(sidePanelWillStartMoving:);
    if ([currentPanningVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
        [currentPanningVC respondsToSelector:selector]) {
        [(id)self.currentPanningVC sidePanelWillStartMoving:self.currentPanningVC];
    }

    if ([centerVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
        [centerVC respondsToSelector:selector]) {
        [(id)centerVC sidePanelWillStartMoving:self.currentPanningVC];
    }
}

完成组和非配对代码组中的代码相同。而这种情况往往一样,我指的是两者的结果相同,但只是一ated。

确实,这两位我都有两个完全相同的法典,我如何能够避免这种情况?

感谢!

Answer 1

• 制造物体并使用它们。

void (^yourBlock)(BOOL finished);

yourBlock = ^{

        // same code as below
        SEL selector = @selector(sidePanelWillStartMoving:);
        if ([currentPanningVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
            [currentPanningVC respondsToSelector:selector]) {
            [(id)self.currentPanningVC sidePanelWillStartMoving:self.currentPanningVC];
        }

        if ([centerVC conformsToProtocol:@protocol(CHSurroundedViewDelegate)] &&
            [centerVC respondsToSelector:selector]) {
            [(id)centerVC sidePanelWillStartMoving:self.currentPanningVC];
        }
    }

您的守则

    if (animated) {
    [UIView animateWithDuration:0.3 animations:^{            
        view.frame = newFrame;
    } completion:yourBlock];
}
else {
yourBlock();
}

Answer 2

为您的估算和完成代码设定了块状变量,并在未商定的情况下援引这些变量。例如:

void (^animatableCode)(void) = ^{
    view.frame = newFrame;
};

void (^completionBlock)(BOOL finished) = ^{
    // ...
};

if (animated) {
    [UIView animateWithDuration:0.3f animations:animatableCode completion:completionBlock];

} else {
    animatableCode();
    completionBlock(YES);
}

友情链接