如何在UIView中使用UIImageView並應用NSLayoutConstraint？

我需要應用NSLayoutConstraints UIImageView裏面的UIView。我嘗試以編程方式執行此操作，但遇到無法同時滿足約束條件的錯誤。如何在UIView中使用UIImageView並應用NSLayoutConstraint？

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; 
containerView.backgroundColor = [UIColor greenColor]; 

UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,50,50)]; 
imageView.backgroundColor = [UIColor redColor]; 

[self.view addSubview:containerView]; 
[containerView addSubview:imageView]; 

NSDictionary *views = [NSDictionary dictionaryWithObjectsAndKeys: 
         containerView,@"contrainerview", 
         imageView, @"myimageview", 
         nil]; 

containerView.translatesAutoresizingMaskIntoConstraints = NO; 

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-(100)-[contrainerview(300)]->=0-|"] options:0 metrics:nil views:views]]; 
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|[contrainerview(300)]->=0-|"] options:0 metrics:nil views:views]]; 
[containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-(100)-[myimageview]->=0-|"] options:0 metrics:nil views:views]];

2015-01-09 14:36:52.476 test[543:6554] 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 unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "", "" )

Will attempt to recover by breaking constraint

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

來源

2015-01-05 iamarnold

請在問題中包含錯誤 – danh

我添加了錯誤。此行導致了以下錯誤：[containerView addConstraints：[NSLayoutConstraint constraintsWithVisualFormat：[NSString stringWithFormat：@「V：| - （100） - [myimageview] - > = 0- |」] options：0 metrics：nil views：views]] ; – iamarnold

你可以試試這個：刪除XIB文件中的所有translatesAutoresizingMaskIntoConstraints屬性（廈門國際銀行開放的源代碼）。

來源

2015-01-06 09:00:31

我不使用xib文件。一切都以編程方式在我的ViewDidLoad中創建。 – iamarnold

，因爲你創造了一切動態，你也需要做出imageView.translatesAutoresizingMaskIntoConstraints = NO;

注意：這是創建的視圖編程的UIViewtranslatesAutoresizingMaskIntoConstraints屬性必須設置爲NO爲正常工作的約束。

來源

2018-02-12 05:42:58

如何在UIView中使用UIImageView並應用NSLayoutConstraint？

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