小贝子编程

Xcode UIView随机调整大小



我正在开发一款iphone游戏，我在动态生成关卡屏幕时遇到了问题。我有一个scrollview包含一堆关卡包按钮，它被添加到我的视图控制器的主视图。我把滚动视图设置成屏幕的宽度，一切都很好。

当我运行应用程序时，一切都很完美。然而，在1-30秒后，滚动视图会神奇地决定将其宽度减半，我完全不知道为什么。

我已经尝试重写viewDidLayoutSubviews和硬编码那里的宽度，但这不起作用。而且，当我运行应用程序时，我几乎不做任何操作。我甚至没有触碰手机本身，scrollview就会改变大小，所以我不知道是什么触发了scrollview改变大小。

以前有人听说过这个bug吗?如果有，你知道怎么解决吗?

声明如下:

这个有自定义字体，所以忽略自定义字体，它也有自定义调整大小的宏可以伸缩到所有iPhone的大小，和自定义颜色，也忽略它们:

_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))];

约束条件如下:

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，内容视图和scrollView的内容视图大小相同，这里的最佳点是宏调整器它使srollview在自动布局中伸缩即使你基本上声明了高度和宽度垂直和高度约束为常量。

宏，为更好的措施:

#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

另外，没有必要摆弄布局子视图之类的东西，你可以在ViewDidLoad或子类的默认初始化器中声明和设置所有这些，你不需要考虑那么多，你还可以在内容视图中设置约束。

另一种方法是，如果你在没有内容视图的情况下设置了UIScrollView，那么你就必须显式地声明所有的水平约束，并使用硬编码的WIDTH值，以便它永远不会收缩，参见以下内容:

_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]];

我在约束中显式声明了滚动视图的水平宽度只要spacerLine1存在于子视图

中它就会保留整个滚动视图的宽度

还有一件事，以上两种方法都使用了苹果的技术说明，我倾向于更喜欢第二种方法，但第一种方法对于复杂的动画是必要的，因为滚动视图将作为contentView的调色板，后者的子视图可以被约束/更新/动画等等。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，但如果你计划动画化内容视图的子视图的约束，你显然仍然需要调用layouttifneeded

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