Question

好的，所以我坚持这个问题。我正在获取一个2-15个标题（NSStrings）的数组，它被传递到我的自定义类TriButtonGroup中，变成一行/多行按钮！按钮组（UIButton的子类）将水平排列，如果它们都适合！只要所有标题都适合按钮，这就可以正常工作！但是如果水平空间不足，我需要TriButtonGroup将一些按钮移动到一个新行。请参阅附带的图片以获得更好的细节。

enter image description here

这是我的代码，现在，它没有处理字符串太长的情况..我只是无法理解这个！：（

int numButtons = [titleArray count];
        int counter = 0;
        TriButtonCell *previousButton = nil;

        for(NSString *title in titleArray) {

            TriButtonCell *button = [[TriButtonCell alloc] initWithFrame:CGRectMake(0,0,0,0)];
            [button setTitle:title forState:UIControlStateNormal];
            [button setTag:1250+counter];
            [button addTarget:nil action:@selector(pushButton:) forControlEvents:UIControlEventTouchDown];
            [button.titleLabel setNumberOfLines:1];
            [button setTranslatesAutoresizingMaskIntoConstraints:NO];
            [self addSubview:button];

            //Add the correct sizing!
            if(previousButton != nil) {
                [self addConstraint:[NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:previousButton attribute:NSLayoutAttributeRight multiplier:1.0f constant:0.0f]];
                [self addConstraint:[NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:previousButton attribute:NSLayoutAttributeWidth multiplier:1.0f constant:0.0f]];
            } else {
                //This is the first button! Set the correct width!
                [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[button]" options:0 metrics:metricsDictionary views:NSDictionaryOfVariableBindings(button)]];
            }
            [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[button(60)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(button)]];

            previousButton = button;

            counter++;
        }

        //Set the distance to the last button!
        [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[previousButton]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(previousButton)]];
    }

Answer 1

我唯一能想到的就是询问每个TriButtonCell的{{1}}并手动设计哪些按钮适合一行，并分别为每一行创建约束。

像这样的东西（写在我的头顶，所以它可能不是100％准确）

intrinsicContentSize

创建自动布局按钮组

1 个答案: