UIView无法改变尺寸大小怎么办？总是XIB建立的代码。

Posted 2023-05-10

参考技术A UIView *view = [[[NSBundle mainBundle] loadNibNamed:@"xxxx" owner:nil options:nil] firstObject];
view.frame = xxxx;

[self.view addSubView:view];
这种情况, 是把view作为一个单独的文件管理的,
它的结构是(假如叫TestView)
TestView.h
TestView.m
TestView.xib

你还有一种可能, 就是你本身有一个UIViewController, 对应一个xib文件, 在这个viewController内部有一个UIView
而这个UIView你使用了AutoLayout, 所以不能简单的通过改frame来实现, 你应该改的是这个UIView的layout, 也就是对应的NSLayoutConstraint

你看一下你用的是哪种方式来做的本回答被提问者和网友采纳

calayer 没有根据 tableview 单元格中的 UIView 大小而改变

【中文标题】calayer 没有根据 tableview 单元格中的 UIView 大小而改变

【英文标题】：calayer did not change according to UIView size in tableview cell

【发布时间】：2017-05-17 05:22:33

【问题描述】：

自定义 UITableViewCell 中有一个 view1(UIView)，我希望在 AutoLayout 之后绘制新尺寸的 view1(UIView) 来绘制边框

UITableViewCell 的内容是动态的，因此我使用了 UITableViewAutomaticDimension 来自动调整大小

我也使用以下方法，但我得到了原始尺寸。展开后我无法获得 view1(UIView) 的新尺寸

[self.tblView1 setNeedsLayout];
[self.tblView1 layoutIfNeeded]; 
[cell.view1 setNeedsLayout];
[cell.view1 layoutIfNeeded];

CALayer *rightBorder = [CALayer layer];
            rightBorder.backgroundColor = [[UIColor redColor] CGColor];
            rightBorder.frame = CGRectMake(cell.view1.frame.size.width-1, 0, 1, cell.view1.frame.size.height);
            [cell.view1.layer addSublayer:rightBorder];

rightBorder 是绘制的，但根据 view1 的（UIView）原始尺寸，即 Width = 394 Height = 322 不根据 view1 的（UIView）新尺寸后的布局尺寸，即 Width = 394 Height = 422

【问题讨论】：

你设置了tableView的estimatedRowHeight属性了吗？

@Rishab 当然是的，兄弟 self.tbl.estimatedRowHeight = 323; self.tbl.rowHeight = UITableViewAutomaticDimension;没有上面的代码，我无法得到动态单元格大小的结果

你是在initWithFrame:里面写代码还是自定义方法？

@Rishab 你在下面的代码中使用 abt 是的，我写了 rightBorder.frame = CGRectMake(cell.view1.frame.size.width-1, 0, 1, cell.view1.frame.size.height );如果不是，那么我应该写什么 initWithFrame

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【参考方案1】：

试试这个。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

if(tableView.tag == self.tblEditorialCalendar.tag)


UIView *leftBorder = [UIView new];
leftBorder.backgroundColor = [UIColor redColor];
leftBorder.translatesAutoresizingMaskIntoConstraints = NO;

UIView *topBorder = [UIView new];
topBorder.backgroundColor = [UIColor greenColor];
topBorder.translatesAutoresizingMaskIntoConstraints = NO;

UIView *rightBorder = [UIView new];
rightBorder.backgroundColor = [UIColor blueColor];
rightBorder.translatesAutoresizingMaskIntoConstraints = NO;

UIView *bottomBorder = [UIView new];
bottomBorder.backgroundColor = [UIColor yellowColor];
bottomBorder.translatesAutoresizingMaskIntoConstraints = NO;

[cell addSubview:leftBorder];
[cell addSubview:topBorder];
[cell addSubview:rightBorder];
[cell addSubview:bottomBorder];

[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[leftBorder(3)]"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(leftBorder)]];
[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[leftBorder]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(leftBorder)]];

[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-3-[topBorder]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(topBorder)]];
[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[topBorder(1)]"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(topBorder)]];

[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[rightBorder(1)]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(rightBorder)]];
[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[rightBorder]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(rightBorder)]];

[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-3-[bottomBorder]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(bottomBorder)]];
[cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[bottomBorder(1)]|"
                                                             options:0
                                                             metrics:nil
                                                               views:NSDictionaryOfVariableBindings(bottomBorder)]];


cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;

另一种方法是使用布局锚（iOS 9 及更高版本支持）而不是 VFL

[leftBorder.widthAnchor constraintEqualToConstant:3].active = YES;
[cell.leadingAnchor constraintEqualToAnchor:leftBorder.leadingAnchor constant:0].active = YES;
[cell.topAnchor constraintEqualToAnchor:leftBorder.topAnchor constant:0].active = YES;
[cell.bottomAnchor constraintEqualToAnchor:leftBorder.bottomAnchor constant:0].active = YES;

[topBorder.heightAnchor constraintEqualToConstant:1].active = YES;
[cell.leadingAnchor constraintEqualToAnchor:topBorder.leadingAnchor constant:3].active = YES;
[cell.topAnchor constraintEqualToAnchor:topBorder.topAnchor constant:0].active = YES;
[cell.trailingAnchor constraintEqualToAnchor:topBorder.trailingAnchor constant:0].active = YES;

[rightBorder.widthAnchor constraintEqualToConstant:1].active = YES;
[cell.trailingAnchor constraintEqualToAnchor:rightBorder.trailingAnchor constant:0].active = YES;
[cell.topAnchor constraintEqualToAnchor:rightBorder.topAnchor constant:0].active = YES;
[cell.bottomAnchor constraintEqualToAnchor:rightBorder.bottomAnchor constant:0].active = YES;

[bottomBorder.heightAnchor constraintEqualToConstant:1].active = YES;
[cell.leadingAnchor constraintEqualToAnchor:bottomBorder.leadingAnchor constant:3].active = YES;
[cell.trailingAnchor constraintEqualToAnchor:bottomBorder.trailingAnchor constant:0].active = YES;
[cell.bottomAnchor constraintEqualToAnchor:bottomBorder.bottomAnchor constant:0].active = YES;

或者您可以只在您的 nib 文件中获取四个视图（作为四个边框）并将它们放置在适当的约束条件下。