Xcode UIView 正在随机调整大小

Question

我正在为 iPhone 开发一款游戏，但在使用动态生成的关卡屏幕时遇到了问题。我有一个包含一堆关卡包按钮的滚动视图，这些按钮被添加到我的视图控制器的主视图中。我将 scrollview 设置为屏幕的宽度，一切都很好。

当我运行应用程序一切正常时。然而，在 1-30 秒后，滚动视图将神奇地决定将其宽度减半，我完全不知道为什么。

我已经尝试覆盖 viewDidLayoutSubviews 并在那里硬编码宽度，但这不起作用。此外，当我运行应用程序时，我实际上什么也没做。我什至没有触摸 phone 本身，滚动视图会改变大小，所以我不知道是什么触发了滚动视图首先改变大小。

有没有人听说过或遇到过这个错误？如果是这样，您知道如何解决吗？

提前致谢。

Answer 1

声明如下：

它有自定义字体，所以请忽略自定义字体，它还有自定义大小调整宏，可以灵活适应所有 iphone 大小，还有自定义颜色，也请忽略它们：

_scrollPlaceholder = [UIScrollView new];
[_scrollPlaceholder setDelegate:self];
[_scrollPlaceholder setShowsHorizontalScrollIndicator:FALSE];
[_scrollPlaceholder setPagingEnabled:false];
[_scrollPlaceholder setBackgroundColor:NSHMasterLightBlueColor];
[_scrollPlaceholder setFrame:CGRectMake(0, heightResizer(50)+heightForNSHNavBar, SCREEN_WIDTH, heightResizer(50))];
[_scrollPlaceholder setContentSize:CGSizeMake(SCREEN_WIDTH*3, heightResizer(50))];
[_scrollPlaceholder setScrollEnabled:true];
[_scrollPlaceholder setKeyboardDismissMode:UIScrollViewKeyboardDismissModeInteractive || UIScrollViewKeyboardDismissModeOnDrag];
[_scrollPlaceholder setBounces:false];
[_scrollPlaceholder setDirectionalLockEnabled:true];
[self addSubview:_scrollPlaceholder];

UIView *contentView;
contentView = [[UIView alloc] initWithFrame:CGRectMake(0,0,SCREEN_WIDTH*2.2, heightResizer(50))];
[_scrollPlaceholder addSubview:contentView];
[_scrollPlaceholder setContentSize:CGSizeMake(SCREEN_WIDTH*2.2, heightResizer(50))];

这是限制条件：

NSDictionary * views = NSDictionaryOfVariableBindings(_searchOption1, _searchOption2, _searchOption3, _searchOption4, _searchOption6, _searchOption7, sp1, sp2, sp3,sp4,sp6,sp7,sp8);
NSDictionary * metrics = @{@"sp" : @10, @"spd" : @(heightResizer(40)), @"this" : @(widthResizer(157.0))};

[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[sp1(>=0)]-[_searchOption1]-[sp2(==sp1)]-[_searchOption2]-[sp3(==sp1)]-[_searchOption3]-[sp4(==sp1)]-[_searchOption4]-[sp6(==sp1)]-[_searchOption6]-[sp7(==sp1)]-[_searchOption7]-[sp8(==sp1)]-|" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption1(spd)]" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption2(spd)]" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption3(spd)]" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption4(spd)]" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption6(spd)]" options:0 metrics:metrics views:views]];
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[_searchOption7(spd)]" options:0 metrics:metrics views:views]];

你看，内容视图与 scrollView 的内容视图大小相同，这里的最佳位置是使 srollview 在自动布局中弯曲的宏调整器，即使你基本上将高度和宽度以及垂直和高度约束声明为常数。

宏，很好的衡量标准：

#define SCREEN_WIDTH ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.width : [[UIScreen mainScreen] bounds].size.height)

#define SCREEN_HEIGHT ((([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortrait) || ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationPortraitUpsideDown)) ? [[UIScreen mainScreen] bounds].size.height : [[UIScreen mainScreen] bounds].size.width)

#define hi(n) n/736.00 //<=== set to largest iphone screen height = iphone 6+
#define his(n) n/414.00 //<=== set to largest iphone screen width = iphone 6+

#define heightResizer(n) hi(n)*SCREEN_HEIGHT
#define widthResizer(n) his(n)*SCREEN_WIDTH

此外，另一件事，不需要 fiddle 布局子视图或类似的东西，你可以在 ViewDidLoad 或子类的默认初始化程序中声明和设置所有这些，你不需要真得想那么多，还可以把content view里设置的constraints动画化。

另一种方法是，如果您在没有内容视图的情况下设置 UIScrollView，那么您将必须使用硬编码的 WIDTH 值显式声明所有水平约束，以使其永不收缩，请参阅以下内容:

_redBackGround = [UIScrollView new];
[_redBackGround setDelegate:self];
[_redBackGround setShowsHorizontalScrollIndicator:FALSE];
[_redBackGround setBackgroundColor:[UIColor whiteColor]];
[_redBackGround setTranslatesAutoresizingMaskIntoConstraints:FALSE];
[_redBackGround setScrollEnabled:true];
[_redBackGround setDirectionalLockEnabled:YES];
[_redBackGround setFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
[_redBackGround setKeyboardDismissMode:UIScrollViewKeyboardDismissModeInteractive || UIScrollViewKeyboardDismissModeOnDrag];
[self addSubview:_redBackGround];

views = NSDictionaryOfVariableBindings(aboutDivider, notificationsDividier, _emailSettingsControl, _passwordSettingsControl, _phoneNumberSettingsControl, _privacyPolicyLinker, _versionNumber, _systemInfoLinker, _userStatsLinker, _contactUsLinker, _termsOfUserLinker, spacerLine1, spacerLine2, spacerLine3, spacerLine4, spacerLine5, spacerLine6, spacerLine7, spacerLine8, spacerLine9, spacerLine10, spacerLine11, _collectionSettings, _messageSettings, _commentSettings, _likesSettings, spacerLinea11, commentsSettingsLabel, collectionsSettingsLabel, messageSettingsLabel, likeSettingsLabel, _zipCodeControl, _zipCodeControl, _catchyMotoControl, spacerLinea12, spacerLinea13, phoneNumberLabel, passwordLabel, emailLabel,  zipCodeLabel, catchyLabelControl);

metrics = @{@"bi" : @(widthResizer(5.0)), @"bh" : @(widthResizer(15.0)), @"sbh" : @(widthResizer(2.0)), @"aw" : @50, @"ah" : @50, @"sp" : @3, @"spd" : @(widthResizer(15.0)), @"sps" : @Spacer, @"fo": @(heightResizer(44.0)), @"smo": @(widthResizer(88.0)), @"fok": @(heightResizer(44.00)), @"spa" : @(widthResizer(20.0)), @"u" : @(widthResizer(404.0)), @"uss" : @(heightResizer(20.0))};

[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine1(u)]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine2]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine3]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine4]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine5]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine6]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine7]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine8]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine9]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine10]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine11]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLinea11]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLinea12]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLinea13]-bi-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[catchyLabelControl]-sbh-[_catchyMotoControl]-sbh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[zipCodeLabel]-sbh-[_zipCodeControl]-sbh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[phoneNumberLabel]-sbh-[_phoneNumberSettingsControl]-sbh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[passwordLabel]-sbh-[_passwordSettingsControl]-sbh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[emailLabel]-sbh-[_emailSettingsControl]-sbh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[notificationsDividier]|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[likeSettingsLabel][_likesSettings(smo)]-bh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[commentsSettingsLabel][_commentSettings(smo)]-bh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[messageSettingsLabel][_messageSettings(smo)]-bh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-spa-[collectionsSettingsLabel][_collectionSettings(smo)]-bh-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[aboutDivider]|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_privacyPolicyLinker]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_versionNumber]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_systemInfoLinker]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_userStatsLinker]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_contactUsLinker]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[_termsOfUserLinker]-spd-|" options:0 metrics:metrics views:views]];
[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-uss-[_phoneNumberSettingsControl(fok)]-sp-[spacerLine1(sps)]-sp-[_passwordSettingsControl(fok)]-sp-[spacerLine2(sps)]-sp-[_emailSettingsControl(fok)]-sp-[spacerLinea13(sps)]-sp-[_zipCodeControl(fok)]-sp-[spacerLinea12(sps)]-sp-[_catchyMotoControl(fok)]-sp-[notificationsDividier(20)]-sp-[_likesSettings(fo)]-sp-[spacerLine9(sps)]-sp-[_commentSettings(fo)]-sp-[spacerLine10(sps)]-sp-[_messageSettings(fo)]-sp-[spacerLine11(sps)]-sp-[_collectionSettings(fo)]-sp-[aboutDivider(20)]-sp-[_privacyPolicyLinker(fok)]-sp-[spacerLine4(sps)]-sp-[_versionNumber(fok)]-sp-[spacerLine5(sps)]-sp-[_systemInfoLinker(fok)]-sp-[spacerLine6(sps)]-sp-[_userStatsLinker(fok)]-sp-[spacerLine7(sps)]-sp-[_contactUsLinker(fok)]-sp-[spacerLine8(sps)]-sp-[_termsOfUserLinker(fok)]-sp-[spacerLinea11(sps)]-sp-|" options:0 metrics:metrics views:views]];

[_redBackGround addConstraint:[NSLayoutConstraint
                               constraintWithItem:passwordLabel
                               attribute:NSLayoutAttributeCenterY
                               relatedBy:NSLayoutRelationEqual
                               toItem:_passwordSettingsControl
                               attribute:NSLayoutAttributeCenterY
                               multiplier:1
                               constant:0]];

[_redBackGround addConstraint:[NSLayoutConstraint
                               constraintWithItem:emailLabel
                               attribute:NSLayoutAttributeCenterY
                               relatedBy:NSLayoutRelationEqual
                               toItem:_emailSettingsControl
                               attribute:NSLayoutAttributeCenterY
                               multiplier:1
                               constant:0]];

[_redBackGround addConstraint:[NSLayoutConstraint
                               constraintWithItem:phoneNumberLabel
                               attribute:NSLayoutAttributeCenterY
                               relatedBy:NSLayoutRelationEqual
                               toItem:_phoneNumberSettingsControl
                               attribute:NSLayoutAttributeCenterY
                               multiplier:1
                               constant:0]];

[_redBackGround addConstraint:[NSLayoutConstraint
                               constraintWithItem:zipCodeLabel
                               attribute:NSLayoutAttributeCenterY
                               relatedBy:NSLayoutRelationEqual
                               toItem:_zipCodeControl
                               attribute:NSLayoutAttributeCenterY
                               multiplier:1
                               constant:0]];

[_redBackGround addConstraint:[NSLayoutConstraint
                               constraintWithItem:catchyLabelControl
                               attribute:NSLayoutAttributeCenterY
                               relatedBy:NSLayoutRelationEqual
                               toItem:_catchyMotoControl
                               attribute:NSLayoutAttributeCenterY
                               multiplier:1
                               constant:0]];

上面有很多子视图，但是你真正想看的是这个：

[_redBackGround addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-bi-[spacerLine1(u)]-bi-|" options:0 metrics:metrics views:views]];

我在约束中明确声明滚动视图的水平宽度，只要 spacerLine1 存在于它的子视图中，这就会保留整个滚动视图的宽度

还有一点，上面两种方法都使用了Apple技术说明中的两种方法，我更喜欢第二种方法，但是第一种对于复杂的动画是必需的，因为scrollview将作为一个调色板子视图的 contentView 可以是 constrained/updated/animated 等。此外，当我说你不需要乱用 layoutSubviews 时，我的意思是你不必使用它来呈现 scrollView，因为它站，但如果您计划为内容视图的子视图的约束设置动画，您显然仍然需要调用 layoutIfNeeded。

Xcode UIView 正在随机调整大小

Xcode UIView being resized randomly

xcode

uiview

ios

swift