autoresizingmask | 易学教程

iOS Autolayout and UIToolbar/UIBarButtonItems

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问题 I have an iOS view with autolayout enabled and have a UIToolbar with a UISearchBar and UISegmentControl contained with the toolbar. I want the UISearchBar to have a flexible width so I need to add a constraint to force this, but from what I can tell you cannot add constraints to items in a UIToolbar in Interface Builder. The options are all disabled. Before AutoLayout I would accomplish this with autoresizingmasks . Are constraints not allowed within UIToolbars/UINavigationBars ? How else can

UIView autoresizingMask - Interface Builder to Code - Programmatically create struts and springs - Swift or Objective-C

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I've laid out some subviews with Interface Builder, but I'd like to do it in code instead. I've read the UIView docs about setting the view.autoresizingMask property. I'm looking for a logical explanation of how to translate the struts and springs by using the various masks offered (e.g. UIViewAutoresizingFlexibleLeftMargin , etc). When setting the autoresizing mask for a view, use a bitwise inclusive OR ( | ) (Objective-C), or an array (Swift 2, 3) to specify springs and struts . Springs are represented by specifying a mask (Objective-C or Swift 3, respectively): vertical spring:

Unable to simultaneously satisfy constraints - No constraints in place

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问题 I have gone through and removed every single user constraint yet I am still getting the following error ONLY after I rotate the device. I have absolutely no clue why though. Does anyone have any ideas? 2013-01-14 21:30:31.363 myApp[35869:c07] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don\'t want. Try this: (1) look at each constraint and try to figure out which you don\'t expect; (2) find the code that added the

UIView autoresizingMask - Interface Builder to Code - Programmatically create struts and springs - Swift or Objective-C

阅读更多关于 UIView autoresizingMask - Interface Builder to Code - Programmatically create struts and springs - Swift or Objective-C

问题 I\'ve laid out some subviews with Interface Builder, but I\'d like to do it in code instead. I\'ve read the UIView docs about setting the view.autoresizingMask property. I\'m looking for a logical explanation of how to translate the struts and springs by using the various masks offered (e.g. UIViewAutoresizingFlexibleLeftMargin , etc). 回答1: When setting the autoresizing mask for a view, use a bitwise inclusive OR ( | ) (Objective-C), or an array (Swift 2, 3, 4) to specify springs and struts .