Highlights of iOS development issues

Recently, many people have asked some basic questions, which are listed here:

1. The slash key on the keyboard breaks down. How can I use a shortcut key to comment out it?

First, the default shortcut for annotation in Xcode is: command + /;

Next, you can modify the shortcut Key: Xcode> Preferences...> Key Bindings, as shown in

2. The navigation area in Xcode is disabled. How can I call it out? For example:

There are three View selection buttons on the right of the toolbar. Select the first option and the navigation area on the left will appear, as shown in the red box:

For an explanation of the Xcode programming environment, I will introduce a book "getting started with iOS game development", published by Tsinghua University Press, and translated by Liu fan. The second chapter of this book will be explained in detail.

3. the toolbar in Xcode is gone. After exiting Xcode, it will not come in again. How can I call it out? For example:

If the Toolbar is visible, the blue selected area is the Hide Toolbar. If the Toolbar is invisible, the Show Toolbar is selected.

4. In a View, there is a background image with several labels and buttons, but only the background image is displayed at runtime, without the Label and Button.

Later it was found that the background image was placed at the top layer and other contents were blocked.

Here I will talk about the background image settings. I know two ways:

1) write code:

 
 

  
  
[self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"bg"]]]; 
 
 

2) drag the image directly to the xib View, but the image must be placed at the bottom of the view, for example:

5. How to modify the UITextField height?

The default height of UITextField cannot be modified. However, you can modify the Border Style. For example, except the last one, the height cannot be modified.

Generally, in a project, the UITextField border is designed by the UI, so select the first borderless border.

6. Which blue file is called in the implementation file when the following code is written in the header file?

 
 

  
  
@interface testController:UIViewController 
  
  
{ 
  
  
    buleController *bule; 
  
  
} 
  
  
property(nonatomic, strong) buleController *bule; 
 
 

1) when writing a bule directly, it calls @ interface testController: UIViewController {buleController * bule;} Here's blue;

2) When writing _ bule and self. bule, the call is the property (nonatomic, strong) buleController * bule;

_ Bule syntax is similar to @ interface testController: UIViewController {buleController * bule;} calling blue here

Self. bule is the get and set methods of the called property (nonatomic, strong) buleController * bule;

Write it here today, and write it next time...