以编程方式访问iPad发布图像？

Question

我在(?=[0-9])中使用LaunchImage.launchimage来管理启动图片。但我也试图在应用程序中使用启动图像。

我看过this answer：

  

文档指出UIImage上的 imageNamed：方法   应自动魔术选择正确的版本

所以，我使用了这段代码

Images.xcassets

在使用iPhone 4,5,6,6+时，它可以正常工作并获得正确的LaunchImage，但在处理 iPad视网膜时，它会返回UIImageView *backImage = [UIImageView new]; backImage.image = [UIImage imageNamed:@"LaunchImage"]; ，这是LaunchImage的 iPhone 4s LaunchImage-700@2x.png

那么如何以编程方式访问iPad的正确LaunchImage？

640 x 960 pixels文件夹中的Contents.json

的内容

LaunchImage

Answer 1

我使用长方法

解决了这个问题

BOOL deviceIsIpad = NO;
if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad ) {
    deviceIsIpad = YES;
}

if (!deviceIsIpad) {
    backImage.image = [UIImage imageNamed:@"LaunchImage"];
} else {
    UIInterfaceOrientation interfaceOrientation = self.interfaceOrientation;
    CGFloat screenScale = [[UIScreen mainScreen] scale];
    if (interfaceOrientation == UIDeviceOrientationPortrait || interfaceOrientation == UIDeviceOrientationPortraitUpsideDown){
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait~ipad.png"];
        }
    } else {
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape~ipad.png"];
        }
    }
}

Answer 2

我相信这些扩展（例如-700-Landscape @ 2x~ipad）无法识别。

将以下项目添加到Contents.json中仅用于测试目的：

class Users::RegistrationsController < Devise::RegistrationsController
  def new
    super
  end

  def create
    super
  end

  protected

  def after_sign_up_path_for(resource)
    '/after_signup'
  end
end

class AfterSignupController < ApplicationController
  include Wicked::Wizard

  steps :name, :username, :bio, :image

    def show
      binding.pry
      @profile = current_user.profile
      render_wizard(@profile)
    end

    def update
      @profile = current_user.profile
      @profile.update(profile_params)
      render_wizard(@profile)
    end

    private

    def profile_params
      params.require(:profile).permit(:username, :first_name, :last_name, :bio, :image, :user_id)
    end
end

class ApplicationController < ActionController::Base
  before_filter :configure_permitted_parameters, if: :devise_controller?

  private

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:email, :password, :password_confirmation, profile_attributes: [:user_id, :first_name, :last_name, :username, :bio, :image])}
    devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:email, :password, :password_confirmation, profile_attributes: [:user_id, :first_name, :last_name, :username, :bio, :image])}
    devise_parameter_sanitizer.for(:sign_in) { |u| u.permit(:login, :username, :email, :password, :remember_me) }
  end
end


##name.html.erb
<%= bootstrap_form_for(@profile, url: wizard_path, method: :put) do |f| %>
<div class="row">
  <div class="field col-xs-8 col-sm-6">
    <div class="field">
      <%= f.text_area :first_name, autofocus: true %>
      <%= f.text_area :last_name, autofocus: true %>
    </div>
  </div>
</div>
<% end %>

<div class="actions">
  <%= f.submit "Next", :class => 'btn btn-primary' %>
  or <%= link_to "skip", next_wizard_path %>
</div>


##username.html.erb
<%= bootstrap_form_for(@profile, url: wizard_path, method: :put) do |f| %>
<div class="row">
  <div class="field col-xs-8 col-sm-6">
    <div class="field">
      <%= f.text_area :username, :placeholder => 'username' autofocus: true %>
    </div>
  </div>
</div>
<% end %>

<div class="actions">
  <%= f.submit "Next", :class => 'btn btn-primary' %>
  or <%= link_to "skip", next_wizard_path %>
</div>


##bio.html.erb
<%= bootstrap_form_for(@profile, url: wizard_path, method: :put) do |f| %>
<div class="row">
  <div class="field col-xs-8 col-sm-6">
    <div class="field">
      <%= f.text_area :bio, autofocus: true %>
    </div>
  </div>
</div>
<% end %>

<div class="actions">
  <%= f.submit "Next", :class => 'btn btn-primary' %>
  or <%= link_to "skip", next_wizard_path %>
</div>


##image.html.erb
<%= bootstrap_form_for(@profile, url: wizard_path, method: :put) do |f| %>
<div class="row">
  <div class="field col-xs-8 col-sm-6">
    <div class="field">
      <%= f.text_field :image, autofocus: true %>
    </div>
  </div>
</div>
<% end %>

<div class="actions">
  <%= f.submit "Submit", :class => 'btn btn-primary' %>
</div>

现在尝试使用imageNamed：方法。

或尝试使用图像全名：

的imageNamed :.

{
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage.png",
      "scale" : "1x"
}

Answer 3

<强> LaunchImage.launchimage

您是否真的使用Images.xcassets来管理启动图片？ 你不是在使用LaunchImage.launchimage吗？

如果是这样，就会出现混乱。您无法使用[UIImage imageNamed:@"LaunchImage"];中的LaunchImage.launchimage加载。

规范名称

• LaunchImage.png
• LaunchImage@2x.png
• LaunchImage-700@2x.png
• LaunchImage-568h@2x.png
• LaunchImage-700-568h@2x.png
• LaunchImage-700-Landscape@2x~ipad.png

该列表中

LaunchImage-700- 人像 @2x~ipad.png 不。