autolayout

Autoresizing: As early as possible, only constraints on the parent control (note: To turn off autolayoutsize classes to see autoresizing)Code corresponds to:The Autoresizingmask property in UIView.h@property (nonatomic) uiviewautoresizing autoresizingmask; Simple resize. Default is Uiviewautoresizingnonetypedef ns_options (Nsuinteger, uiviewautoresizing) {Uiviewautoresizingnone = 0,Uiviewautoresizingflexibleleftmargin = 1 Uiviewautoresizingflexiblewidth = 1 Uiviewautoresizingflexiblerightmargin

IOS Crash handling: This application is modifying the autolayout engine from a background thread, modifying I. error message This application is modifying the autolayout engine from a background thread, which can lead to engine Crash uption and weird crashes. this will cause an exception in a future release." Ii. Incorrect writing Let's take a look at the code writing ,: Iii. Cause of errorThen I o

]; // 1.1 set expiration to no to enable autolayout to take effect. translatesautoresizingmaskintoconstraints = no; // 2. add to parent view [self. view addsubview: button]; // 3. create a constraint // The left boundary of the 3.1 button is 100 from the left boundary of the top view, and the distance from nslayoutconstraint * conx = [nslayoutconstraint constraintwithitem: button attribute: nslayoutattriattrieleft relatedby: custom. view attribute: se

); Make.right.equalTo (V1.mas_left); Make.top.equalTo (V1.mas_bottom);}]; [V3 mas_makeconstraints:^ (masconstraintmaker *make) {Make.centerX.equalTo (Scrollview.mas_ right); Make.size.mas_equalTo (size); Make.left.equalTo (V1.mas_right); Make.top.equalTo (V1.mas_bottom);}]; [V4 mas_makeconstraints:^ (Masconstraintmaker *make) {Make.centerY.equalTo (Scrollview.mas_ bottom); Make.size.mas_equalTo (size); Make.left.equalTo (V1.mas_left); Make.top.equalTo (V2.mas_bottom);}]; E

UITableView is almost every app needs to use the control, and cell height adaptive is what we need to master, of course, the cell above the control is also a variety of manifestations, the small part of today is one of the more common: Auto Layout with UILabel in UITableViewCell.Words not much to say, on the tutorial.First we create a Sigle View application project, then drag the previous UITableView to storyboard, set up the proxy and set the constraints. Constraints here do not explain, you ca

First, before we formally use masonry, let's take a look at how we use AutoLayout in Xib.as we can see, as long as the corresponding limitations are set, controlling the relationship between the parent and child views should be OK to drag out the requirements you need. Here is not a detailed explanation of the specific drag-and-drop method ..... Then we press the properties to see how simple it is to use masonry here is masonry give us the property @p

When you use AutoLayout to constrain, you may want to change the constraint on a view halfwayA set of constraints that can only change the constant parameter during code execution and that the constrained object and reference scale cannot be changedNow I know a new skill: change a constraint by changing the precedence of a constraintWhen priority is 1000, it is not possible to change the precedence, so the xib can always lower the priority, then add s

(V1.mas_bottom);}]; [v3mas_makeconstraints:^ (Masconstraintmaker*make) { Make.centerX.equalTo (scrollview.mas_right); make.size.mas_ Equalto (size); make.left.equalto (v1.mas_right); make.top.equalto (V1.mas_bottom);}]; [v4mas_makeconstraints:^ (Masconstraintmaker*make) NBSP;{NBSP;NBSP;NBsp;make.centery.equalto (Scrollview.mas_bottom); Make.size.mas_equalTo (size); make.left.equalto (V1.mas_left); Make.top.equalTo (V2.mas_bottom);}];EffectThe four-direction constraint points to the center point

Adapting to the UI of a different size device:Most of the time, our app may be running on different sizes of devices, or the display should not be the same. This requires that the location and size of the controls in the UI cannot be written to death.For different sizes of UI adaptation, there are generally three countermeasures: The worst-case: hard coding, to different devices, write different code layout.Determine the other models in your code to set different positions for each control accor

First, AutoLayout automatic layout:1, set all the view frame three methods, can be created by code or storyboard set = Rule(1 Blue line + constraint : (position) use the Blue Line, drag the control according to the Blue Line, just tell Xcode I want to set it up, but also need Xcode to enforce the rules and constraints for us Reset to sugested constrains in VIew Controller (provided that the Blue Line is used)(2 Click the Bottom menu button : Add New a

When using storyboard and xib, we often use ScrollView, as well as automatic layout autolayout, but ScrollView and AutoLayout are used in a relatively complex sense. According to the practice, I say my understanding, in the storyboard or Xib, ScrollView determines the size of the contentsize based on the size of the view below it.Take a look at the effect1. Create a project, drag a scrollview into the story

You set the constraint for Aview using AutoLayout in Xib or storyboard, but you want Aview to make a simple animation, such as a simple animation that moves from the constrained a position (0,0,100,100) to the B position (0,66,100,100).Then you'll find that if you set a constraint in Xib or storyboard, it doesn't work to modify the Aview frame directly in the code.The result is no problem on the iOS7, but found on the iOS8 Aview moved from a to B, but

Refer to the automatic Layout tutorial one we implemented this interface in Xcode7 (because the tutorial was done again since the earlier version of Xcode), the PIN option is not available in Xcode7.The design diagram is as follows:Implement Step one: Drag and drop three view on Stroyboard with different colors, change them to the size similar to the design diagram as followsImplementation Step two: Through the observation of the design chart can be found three view, the upper half of two view w

AutoLayout: VFL language code implementation (a magic language) and autolayoutvfl1. What is VFL? Why is VFL required?VFL stands for Visual Format Language. It is translated as "Visual Format Language". VFL is an abstract Language code analysis launched by Apple to simplify Autolayout encoding: 1 NSArray *arr = [NSLayoutConstraint constraintsWithVisualFormat:options: metrics:views: VisualFormat:VFL statem

How do I modify the value of a AutoLayout constraint? There are 5 kinds of methods I know about 1. Modify the frame (sometimes it may not work, but you can animate) 2. Modify the value of the constraint's float by 3. Use Visualformat language 4. Use Constraintwithitem to change the magnification, such as 2x+1=y 5. Remove a constraint (remove at runtime), add a new constraint The previous article has talked about how to use storyboard to create c

First, error hintsToday at the time of development encountered a crash problem, "This application is modifying the AutoLayout engine from a background thread, which can leads to engine COrruption and weird crashes. This would cause an exception in a future release. "Second, the wrong wordingLet's take a look at the code's wording:Iii. Causes of ErrorsLater, after observing the code, it was discovered that the UI-caused crash was updated in the child t

Xib--autolayout add constraint Imitation QQ Login interface: Description: The following image background red is only convenient to see clearly; 1. Create a project: Create a XIB file 2. Open the XIB file: (1). Create Avatar: Drag control: uiimageview--"put anywhere-" Click the Align key, pin key, such as: At this time: can be arbitrarily constrained to control: Description: Because of time, not introduced to slowly self-pondering; Align key: horizonta

cell is constrainted by auto layout and each edge (" Top "," left "," bottom "," right ") have at least One layout constraint against it An adaptive height cell is constrained by AutoLayout, and the constraints of all internal controls are integrated, at least one time from the cell four edge ( top left bottomright), or bad oneAs shown in the following:The direction that the arrow refers to must appear at least once is a complete set of constrain

PrefaceiOS devices are growing in size and may be adapted to a variety of devices for an app. Multiple sizes. So. We expect our app to be autoLayout . This article is mainly about using in Xcode constraint . This article will be updated on an irregular basis in the future.ConventionsThe view in this article refers to the various view dragged from the Objuect library.BasisA view is displayed at the interface with at least three decision conditions

Code calculation--autoreszing (relationship between parent and child controls), AutoLayout (any control can produce a relationship), Sizeclass 1, Brief introductionEach constraint has a priority in AutoLayout, with a priority range of 1 to 1000, and the default created constraint priority is the highest of 1000. At the core of my understanding of constraint precedence is the issue of resolving constraint c