添加UISLider与自动布局编程 [英] Add UISLider with Autolayout programmatically

问题描述

我想一个UISlider添加到我的看法编程，包括限制，以便其宽度适应整个屏幕宽度。
这是我走到这一步：

  // 2添加UISlider
self.slider = [[UISlider的alloc]初始化];
[self.view addSubview：self.slider];[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.slider
                                                      属性：NSLayoutAttributeLeft
                                                      relatedBy：NSLayoutRelationEqual
                                                         toItem：self.view
                                                      属性：NSLayoutAttributeLeft
                                                     事半功倍：1
                                                       常数：0]];
[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.slider
                                                      属性：NSLayoutAttributeRight
                                                      relatedBy：NSLayoutRelationEqual
                                                         toItem：self.view
                                                      属性：NSLayoutAttributeRight
                                                     事半功倍：1
                                                       常数：0]];[self.view addConstraint：[NSLayoutConstraint constraintWithItem：self.slider
                                                      属性：NSLayoutAttributeBottom
                                                      relatedBy：NSLayoutRelationEqual
                                                         toItem：self.view
                                                      属性：NSLayoutAttributeBottom
                                                     事半功倍：1
                                                       常数：0]];
 

解决方案

缺少 self.slider.translatesAutoresizingMaskIntoConstraints = NO; 您code是我工作的罚款。见下面的图片

I'm trying to add a UISlider to my view programmatically including constraints so that its width adapts to the whole screen width. This is what I got so far:

//2 Add UISlider
self.slider = [[UISlider alloc] init];
[self.view addSubview:self.slider];

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.slider
                                                      attribute:NSLayoutAttributeLeft 
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:self.view 
                                                      attribute:NSLayoutAttributeLeft 
                                                     multiplier:1 
                                                       constant:0]];


[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.slider
                                                      attribute:NSLayoutAttributeRight 
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:self.view 
                                                      attribute:NSLayoutAttributeRight 
                                                     multiplier:1 
                                                       constant:0]];

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.slider
                                                      attribute:NSLayoutAttributeBottom 
                                                      relatedBy:NSLayoutRelationEqual
                                                         toItem:self.view 
                                                      attribute:NSLayoutAttributeBottom 
                                                     multiplier:1 
                                                       constant:0]];

解决方案

Missing self.slider.translatesAutoresizingMaskIntoConstraints = NO; Your code is working fine for me. See the below image

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