如何将 swift NSLayoutConstraint activateConstraints 翻译成 objective c?
How do I translate swift NSLayoutConstraint activateConstraints to objective c?
我在 swift 中成功创建了一个项目,我在 viewController
中按下按钮将其他 viewControllers
或 xib
文件加载到容器中。只是给你一个想法:
它工作得很好,但我很难将它翻译成 objective-c
,而这正是真正需要代码的地方。这是按下按钮时 swift
代码的样子:
let sub3 = UINib(nibName: "thirdXib", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView
containerOutlet.addSubview(sub3)
NSLayoutConstraint.activate([
sub3.leadingAnchor.constraint(equalTo: containerOutlet.leadingAnchor),
sub3.trailingAnchor.constraint(equalTo: containerOutlet.trailingAnchor),
sub3.topAnchor.constraint(equalTo: containerOutlet.topAnchor),
sub3.bottomAnchor.constraint(equalTo: containerOutlet.bottomAnchor)
])
现在,我希望所有代码都在 objective-c
中。在 objective-c
我已经完成了第一部分,我认为这是正确的:
UINib *nib = [UINib nibWithNibName:@"SecondView" bundle:nil];
[nib instantiateWithOwner:self options:nil];
[containerOutlet addSubview:((UIView*)nib)];
但是我对最后一部分有疑问,NSLayoutConstraint activateConstraints
[NSLayoutConstraint activateConstraints:@[
[nib.lead],
[nib.centerXAnchor constraintEqualToAnchor:self.view.centerXAnchor],
]
];
编译器说 property lead not found on object of type UIBib
和下面的代码相同。我已经尝试了这些的变体,但没有做对。如何在我的 xib 上设置尾随、前导、底部和顶部约束?我需要添加 #import SecondView.xib" in the
.h` 文件吗?顺便问一下?
你可以试试
UINib *nib = [UINib nibWithNibName:@"SecondView" bundle:nil];
UIView *sub3 = [nib instantiateWithOwner:self options:nil][0];
[containerOutlet addSubview:sub3];
[NSLayoutConstraint activateConstraints:@[
[sub3.leadingAnchor constraintEqualToAnchor:scontainerOutlet.leadingAnchor],
[sub3.trailingAnchor constraintEqualToAnchor:containerOutlet.trailingAnchor],
[sub3.topAnchor constraintEqualToAnchor:containerOutlet.topAnchor],
[sub3.bottomAnchor constraintEqualToAnchor:containerOutlet.bottomAnchor]
]];
我在 swift 中成功创建了一个项目,我在 viewController
中按下按钮将其他 viewControllers
或 xib
文件加载到容器中。只是给你一个想法:
它工作得很好,但我很难将它翻译成 objective-c
,而这正是真正需要代码的地方。这是按下按钮时 swift
代码的样子:
let sub3 = UINib(nibName: "thirdXib", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView
containerOutlet.addSubview(sub3)
NSLayoutConstraint.activate([
sub3.leadingAnchor.constraint(equalTo: containerOutlet.leadingAnchor),
sub3.trailingAnchor.constraint(equalTo: containerOutlet.trailingAnchor),
sub3.topAnchor.constraint(equalTo: containerOutlet.topAnchor),
sub3.bottomAnchor.constraint(equalTo: containerOutlet.bottomAnchor)
])
现在,我希望所有代码都在 objective-c
中。在 objective-c
我已经完成了第一部分,我认为这是正确的:
UINib *nib = [UINib nibWithNibName:@"SecondView" bundle:nil];
[nib instantiateWithOwner:self options:nil];
[containerOutlet addSubview:((UIView*)nib)];
但是我对最后一部分有疑问,NSLayoutConstraint activateConstraints
[NSLayoutConstraint activateConstraints:@[
[nib.lead],
[nib.centerXAnchor constraintEqualToAnchor:self.view.centerXAnchor],
]
];
编译器说 property lead not found on object of type UIBib
和下面的代码相同。我已经尝试了这些的变体,但没有做对。如何在我的 xib 上设置尾随、前导、底部和顶部约束?我需要添加 #import SecondView.xib" in the
.h` 文件吗?顺便问一下?
你可以试试
UINib *nib = [UINib nibWithNibName:@"SecondView" bundle:nil];
UIView *sub3 = [nib instantiateWithOwner:self options:nil][0];
[containerOutlet addSubview:sub3];
[NSLayoutConstraint activateConstraints:@[
[sub3.leadingAnchor constraintEqualToAnchor:scontainerOutlet.leadingAnchor],
[sub3.trailingAnchor constraintEqualToAnchor:containerOutlet.trailingAnchor],
[sub3.topAnchor constraintEqualToAnchor:containerOutlet.topAnchor],
[sub3.bottomAnchor constraintEqualToAnchor:containerOutlet.bottomAnchor]
]];