Question

我有一个项目，它的大部分布局逻辑都在IB中。我希望动态更新一些定位，所以我把它放在viewDidAppear：

中

- (void)viewDidAppear:(BOOL)animated{
// Fill array of button tools
buttonArray = [[NSArray alloc] initWithObjects:
               self.filterButton, self.bulgeButton, self.stickerButton, self.textButton, self.drawButton, self.invertedBulgeButton, nil];

// Position button tools
int const X_POSITION = 175; // The x position of the tool buttons
int yPosition = 0; // The x position of the tool buttons
CGRect frame = CGRectMake(X_POSITION, yPosition, 100, 100); // The position and size of the tool buttons

// Loop through buttons and set properties
for (UIButton *button in buttonArray) {
    frame.origin.y = yPosition;
    button.frame = frame;
    yPosition += 75;
    button.hidden = false;
}
}

我遇到的问题是，每当我按下另一个按钮时，我在viewDidAppear中应用的所有格式都将被撤消，按钮定位将更改为它们在IB中的位置。如何防止我的按钮移动到IB中设置的位置？

编辑：以下是一些会导致定位发生变化的代码：

// Undoes most recent edit to photo
- (IBAction)undoButtonPress:(id)sender {
    [self undoImage];
}

- (void)undoImage {
    // TODO:  Add all the other current actions.... none of them work because they need to be checked for here
    // Remove tools for the current action
    self.imageSticker.image = nil;
    [self refreshImageText];

    currentAction = NONE;
    self.mainImage.image = [_images pop];

}
// after done editing the text, this resets the text fields so you can create a second text
- (void) refreshImageText{
    self.hiddenTextField.text = @"";
    self.imageText.text = @"";

    self.imageText.transform = CGAffineTransformMakeRotation(0);
    [self.imageText setCenter:self.view.center];
}

Answer 1

您需要更新约束，而不是对象的实际帧。因此，如果您将按钮框y约束添加为IBOutlet，则可以轻松编辑它。

这是一个非常酷的工具，可以使用autolayout约束： https://autolayoutconstraints.com/

Answer 2

我发现AutoLayout正在弄乱我的定位。我能够将translatesAutoresizingMaskIntoConstraints设置为true以防止AutoLayout弄乱我的设置：

// Loop through buttons and set properties
for (UIButton *button in buttonArray) {
    frame.origin.y = yPosition;
    button.frame = frame;
    yPosition += 75;
    button.hidden = false;
    button.translatesAutoresizingMaskIntoConstraints = YES;
}

每当触发操作时，IOS都会查看默认IB布局的更新

2 个答案: