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Generation QR in Objective-C Creating a new class in Xcode

11.3 Creating a new class in Xcode
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New programs will usually be full of new classes. Here are three major reasons why you might create new classes:
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Creating a new class in Xcode
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You might create a totally new class, with different functionality from anything else. If it s a user interface class, it ll probably be a subclass of UIView. If it s a nondisplaying class, it ll probably be a subclass of NSObject. You might create a new class that works similarly to an old class but with some standardized differences. This new class would generally be a subclass of the old class. You might create a new class that has specific event responses built in. This class would also generally be a subclass of the old class.
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Creating a new class and linking it in is easier than you think. In our next example you re going to create a project called newclass that will include the brand-new labeledwebview subclass. Again we ll build it using the Window-Based Application template.
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11.3.1 The new class how-to
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Once you ve gotten your new project going, the process of creating a new class (see table 11.2) is simple, with Xcode (as usual) doing most of the work for you in file creation.
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Table 11.2 Step 1. Create your new file. A few steps in Xcode will quickly create a brand-new object. Description Choose File > New File. Choose the class to use as your parent from among the Cocoa Touch Classes options. Select your filename, preferably an intuitive name reflecting your object. Accept the default setup, including the creation of an .h file. If you weren t able to select your preferred class to subclass, change that now by modifying the parent class in the @interface line of yourclass.h. Add an #import line for your class s header in whatever file will be using it.
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2. Modify your files. 3. Import your object.
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For our sample program, we created the labeledwebview class as a subclass of UIView and then imported our new .h file into our application delegate:
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#import "labeledwebview.h"
Afterward it s a simple matter of designing your class to do the right thing. For our purposes, we ve decided to create an object that will display both a web page and the URL of that web page on the iPhone screen by linking together some existing classes. There are three steps to the process, all of which we ll touch on in this section: you need to write your new header file, you need to write your new source code file, and you need to use the new class inside your program.
11.3.2 The header file
As usual, you ve got the start of a header file already, thanks to Xcode. Listing 11.5 shows how you ll expand it to create your new class.
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Listing 11.5 A header file for a new class
@interface labeledwebview : UIView { UILabel *URLLabel; UIWebView *myWebView; } @property(nonatomic, retain) UILabel *URLLabel; @property(nonatomic, retain) UIWebView *myWebView; - (void)loadURL:(NSString *)url; @end
This is the last time that we re going to look at a header file that has only basic information in it, but since it s your first time working with a new class, we figure it s still worthwhile. Within the header file, you again engage in some of those common declarations that you saw back in our Hello, World! program. First, you declare some instance variables that you want to use throughout your class B. Second, you define those variables as properties C. Third, you declare a method D that you want to make available outside the class. Now you re ready for the actual code.
11.3.3 The source code file
The source code file contains the guts of your new class, as shown in listing 11.6.
Listing 11.6 A source code file for a new class
#import "labeledwebview.h" @implementation labeledwebview @synthesize URLLabel; @synthesize myWebView;
- (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { URLLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, 280, 50)]; myWebView = [[UIWebView alloc] initWithFrame:CGRectMake(20,60,280,400)]; URLLabel.textColor = [UIColor whiteColor]; URLLabel.shadowColor = [UIColor blackColor]; URLLabel.adjustsFontSizeToFitWidth = YES; myWebView.scalesPageToFit = YES; [self addSubview:URLLabel]; [self addSubview:myWebView]; } return self; } - (void)setBackgroundColor:(UIColor *)color { [super setBackgroundColor:color];
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