Question

尝试设置布局约束的宽度和高度，我收到以下错误：

＆＃34;由于未捕获的异常终止应用程序＆＃39; NSInternalInconsistencyException＆＃39;，原因：＆＃39; NSDictionaryOfVariableBindings失败，因为其中一个值为nil，或者调用宏的方式有问题。无法为键＆＃34; infoButton＆＃34;分配值nil。按键:( infoButton＆＃34;

    [holderView addSubview:infoButton];
    // width constraint
    [holderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[infoButton(==44)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(infoButton)]];

    // height constraint
    [holderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[infoButton(==44)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(infoButton)]];

更新：

仍然没有工作，当我的断点仍然没有？

 [holderView addSubview:infoButton];
    holderView.userInteractionEnabled = YES;
    id views = @{@"infoButton": infoButton};

    [holderView addSubview:infoButton];
    // width constraint
    [holderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[infoButton(==44)]" options:0 metrics:nil views:views]];

    // height constraint
    [holderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[infoButton(==44)]" options:0 metrics:nil views:views]];

Answer 1

在设置约束时

infoButton instance is nil。

尝试设置NSLayoutConstraint时出错

1 个答案: