Learn iOS Development UI Chapter--MVC design interface and model conversion of data

1. Dictionary Turn model

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Benefits of 1.1 dictionary to model:

1 > Reduce the coupling of the Code

2 > All Dictionary-to-model sections of code are centralized in one place, reducing the chance of code errors

3 > Direct use of the model's attribute operations in the program to improve coding efficiency

The model should provide a construction method that can pass in the dictionary parameters

-(instancetype) initwithdict: (Nsdictionary *) dict;

+ (instancetype) xxxwithdict: (Nsdictionary *) dict;

1.2instancetype & ID

1 > instancetype on a type representation, as with an ID , can represent any object type

2 > Instancetype can only be used on return value types and cannot be used as an ID on parameter types

3> instancetype One more benefit: The compiler detects the true type of instancetype

1.3 Adding readonly properties to the model

// defines a property, the Getter&setter method is generated, and an underlined member variable is generated

// and if it is the readonly property, only the getter method is generated and no member variable

@property (nonatomic, strong, readonly) UIImage *image;

@interface Lfappinfo ()

{

UIImage *_imageabc;

}

-(UIImage *) image

{

if (!_IMAGEABC) {

_IMAGEABC = [UIImage imagenamed:Self. icon];

}

return _imageabc;

}

Reasonable use of read-only attributes in the model can further reduce the coupling of the code.

1.4 Benefits of using the data model:

* * * caller does not care about any processing details inside the model!

2. XIB

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The Xib file can be used to describe a piece of local UI interface

XIB & Storyboard

Same point:

1 > is used to describe the software interface

2> are edited with the Interface Builder tool

Different points

1 > Xib is lightweight and is used to describe the local UI interface

2 > Storyboard is a heavyweight, a multi-interface for describing the entire software, and can show a jump relationship between multiple interfaces

3. View Packaging Ideas

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1 > If you have more than one child control inside a view , you will typically consider customizing a viewto shield the creation of its inner child controls from the outside world.

2 > the outside world can pass in the corresponding model data to the view, theview gets the model data and sets the corresponding data to the inner child control.