Knowing the discrimination betwixt frames and bounds successful Cocoa is important for immoderate developer aiming to make strong and visually interesting macOS oregon iOS functions. These seemingly akin ideas govern however views are positioned and sized, however their refined variations tin importantly contact your format, particularly once dealing with transformations similar rotation oregon scaling. Mastering these ideas volition empower you to physique much dynamic and responsive person interfaces.
Framework: Positioning a Position Inside its Superview
A position’s framework defines its assumption and dimension comparative to its superview’s coordinate scheme. Deliberation of it arsenic the position’s outer cooperation, specifying wherever it sits inside its genitor position. The framework is expressed arsenic a CGRect construction, which accommodates the root (x, y coordinates) and the measurement (width and tallness).
For case, if a fastener’s framework is (10, 20, 50, 30), it means the fastener’s apical-near area is positioned 10 factors from the near and 20 factors from the apical of its superview, with a width of 50 factors and a tallness of 30 factors. Modifying the framework straight strikes oregon resizes the position inside its genitor.
Once a position undergoes transformations similar rotation, the framework displays the smallest rectangle that encloses the remodeled position. This tin pb to sudden behaviour if you trust solely connected the framework for exact positioning last transformations.
Bounds: Defining a Position’s Section Coordinate Scheme
The bounds, connected the another manus, specify the position’s ain section coordinate scheme. It’s the rectangle that represents the position’s drawable country, with the root sometimes astatine (zero, zero). The bounds besides usage a CGRect construction, representing the measurement and root of this inner coordinate scheme. Ideate it arsenic the position’s inner position, careless of its assumption inside its superview.
Modifying the bounds doesn’t alteration the position’s assumption inside its superview however alters however contented is drawn inside the position itself. For illustration, altering the bounds’ root efficaciously scrolls the contented inside the position.
Dissimilar the framework, the bounds stay unchanged by transformations utilized to the position. This makes the bounds a dependable mention component for format calculations, equal last rotations oregon scaling.
Running with Frames and Bounds successful Codification
Successful Cocoa, you entree and manipulate a position’s framework and bounds utilizing the framework and bounds properties, respectively. You tin retrieve their values oregon fit fresh ones straight. Nevertheless, it’s indispensable to realize the implications of modifying all place, peculiarly once dealing with analyzable position hierarchies and transformations.
For illustration, ideate you privation to halfway a position inside its superview. You may cipher the halfway component of the superview’s bounds and past fit the position’s halfway place, which not directly modifies the framework. Alternatively, if you’re dealing with reworked views, utilizing the halfway place primarily based connected the bounds mightiness beryllium much dependable.
- Usage
frameworkfor positioning inside the superview. - Usage
boundsfor managing the inner coordinate scheme and drafting contented.
Applicable Examples: Once to Usage Which
See a script wherever you rotate a fastener. Utilizing the framework to assumption it last rotation mightiness consequence successful sudden offsets. Alternatively, utilizing the bounds arsenic a mention and past adjusting the halfway component comparative to the superview’s bounds would supply much accordant outcomes. This is due to the fact that the bounds stay unchanged by the rotation, providing a unchangeable coordinate scheme for calculations.
Different illustration is implementing scrolling inside a customized position. By modifying the bounds’ root, you tin efficaciously displacement the available contented with out affecting the position’s framework oregon its assumption inside its superview. This is a communal method for creating customized scroll views oregon dealing with contented offsets successful analyzable layouts.
Pome’s documentation emphasizes the value of knowing these ideas for effectual position direction. They urge utilizing the bounds for drafting and format calculations, particularly once transformations are active, and utilizing the framework for positioning inside the superview’s coordinate scheme.
- Find if you’re positioning inside the superview (framework) oregon managing inner contented (bounds).
- See the contact of transformations connected framework calculations.
- Usage the due place primarily based connected your circumstantial wants.
Infographic Placeholder: Ocular examination of framework and bounds with and with out transformations.
By knowing the delicate however important variations betwixt frames and bounds, you tin make much dynamic, responsive, and visually interesting Cocoa functions. This cognition empowers you to grip analyzable layouts, transformations, and customized drafting with higher precision and power. Research Pomeβs documentation and experimentation with antithetic eventualities to solidify your knowing and unlock the afloat possible of Cocoa’s position scheme. Dive deeper into position direction with this adjuvant assets: Precocious Position Programming.
- Framework: comparative to the superview
- Bounds: section coordinate scheme
For additional exploration, see these assets: UIView Documentation, Cocoa Views Usher, and UIView Tutorial for iOS.
FAQ
Q: What occurs to the framework once a position is rotated?
A: The framework adjusts to embody the rotated position, possibly starring to sudden measurement and assumption adjustments.
Q: However tin I forestall structure points brought about by framework adjustments throughout transformations?
A: Make the most of the bounds for calculations associated to drafting and format, arsenic the bounds stay unaffected by transformations.
Question & Answer :
UIView and its subclasses each person the properties framework and bounds. What’s the quality?
The bounds of an UIView is the rectangle, expressed arsenic a determination (x,y) and measurement (width,tallness) comparative to its ain coordinate scheme (zero,zero).
The framework of an UIView is the rectangle, expressed arsenic a determination (x,y) and dimension (width,tallness) comparative to the superview it is contained inside.
Truthful, ideate a position that has a measurement of 100x100 (width x tallness) positioned astatine 25,25 (x,y) of its superview. The pursuing codification prints retired this position’s bounds and framework:
// This methodology is successful the position controller of the superview - (void)viewDidLoad { [ace viewDidLoad]; NSLog(@"bounds.root.x: %f", description.bounds.root.x); NSLog(@"bounds.root.y: %f", description.bounds.root.y); NSLog(@"bounds.dimension.width: %f", description.bounds.measurement.width); NSLog(@"bounds.dimension.tallness: %f", description.bounds.dimension.tallness); NSLog(@"framework.root.x: %f", description.framework.root.x); NSLog(@"framework.root.y: %f", description.framework.root.y); NSLog(@"framework.dimension.width: %f", description.framework.measurement.width); NSLog(@"framework.measurement.tallness: %f", description.framework.dimension.tallness); }
And the output of this codification is:
bounds.root.x: zero bounds.root.y: zero bounds.dimension.width: one hundred bounds.measurement.tallness: one hundred framework.root.x: 25 framework.root.y: 25 framework.dimension.width: a hundred framework.measurement.tallness: one hundred
Truthful, we tin seat that successful some instances, the width and the tallness of the position is the aforesaid careless of whether or not we are trying astatine the bounds oregon framework. What is antithetic is the x,y positioning of the position. Successful the lawsuit of the bounds, the x and y coordinates are astatine zero,zero arsenic these coordinates are comparative to the position itself. Nevertheless, the framework x and y coordinates are comparative to the assumption of the position inside the genitor position (which earlier we stated was astatine 25,25).
Location is besides a large position that covers UIViews. Seat slides 1-20 which not lone explicate the quality betwixt frames and bounds however besides entertainment ocular examples.
