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Flow Control Statements, Arrays, and Structures
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1 Open LoopingExample in Xcode and open FlipsideViewController in the editor 2 Add the viewDidDisappear method so that it matches Listing 3-8 3 Click Build And Go to build and run the application Tap the info button and then the
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Done button one time and the debugger console displays the statements in Listing 3-9
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Listing 3-8 The viewDidDisappear method
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- (void) viewDidDisappear: (BOOL) animated { [super viewDidAppear:animated]; int x = 0; while (x < 6) { switch(x) { case 1: break; case 2: NSLog("x:%i",x); break; case 3: break; case 4: case 5: NSLog("x:%i",x); break; default: NSLog("default"); } x++; } }
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Listing 3-9
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Objective-C for iPhone Developers: A Beginner s Guide
The Break and Continue Statements
You can use the break keyword in other places than switch statements When looping, you can exit a loop early using the break statement You also can force a loop to skip the remaining statements in its body and continue to the next loop using the continue statement
The Break Statement
To exit a loop immediately, use the break statement The following code snippet illustrates:
for(int x = 0;x != 1000;x++) { if(x == 5) { break; } NSLog(@"x"); }
When executed as part of a program, under normal circumstances, the for loop in the preceding code would loop 1000 times, from x = 0 to x = 999 Here, however, when the x variable s value reaches 5, the logical if statement evaluates to false When false, the program enters the code block preceding the if statement and executes the break statement The break statement forces the program to exit the for loop immediately And so the program only logs 0 through 4 to the debugger console On the fifth iteration, the program exits the for loop
The Continue Statement
To exit a loop s body and return to a loop s logical test immediately, use the continue statement The following code snippet illustrates:
for(int x = 0; x < 10; x++) { if(x==3) { continue; } NSLog(@"x=%i",x); }
When run as part of a program, the program loops 10 times Each loop, except when x reaches 3, logs the x variable s value to the debugger console When x evaluates to 3, the logical if statement evaluates to true and executes the continue statement, which forces the program to skip the remaining statements in the loop s body and return to the loop s logical test
3:
Flow Control Statements, Arrays, and Structures
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Using the Break and Continue Statements
1 Open LoopingExample in Xcode and open the FlipsideViewControllerm file in the editor 2 Add a method called viewWillAppear to the file (Listing 3-10) 3 Click Build And Go to run the application Tap the info button one time and the
debugger console should log the statements in Listing 3-11
Listing 3-10 The viewWillAppear method
- (void)viewWillAppear:(BOOL)animated { int i = 0; while(YES == YES) { i++; if(i == 3) continue; else if(i==5) break; NSLog(@"endless loop: %i", i); } }
Listing 3-11
The debugger console logging
endless loop: 1 endless loop: 2 endless loop: 4 default x:2 x:4 x:5
Arrays and Structures
C arrays and structures are valid in Objective-C Although you will usually use Apple s NSArray when creating your own array and you will usually create your own class rather than create a structure, there are situations where you might be required to use these C data structures Besides, understanding an array is fundamental to understanding the Foundation Framework array classes
Objective-C for iPhone Developers: A Beginner s Guide
Arrays
Sometimes you wish to use a series of values rather than a single value Arrays help you work with multiple values easily For instance, you might have a time series representing your expenses over the past ten days
-(void) expenses() { float expenses[10]; for(int i = 0; i < 10; i++) { expenses[i] = 1000 + i; } }
The function s first line allocates space for ten float values The for loop then assigns the value 10002 + i to each of the values, the results being the series: 1000, 1010, 1020, , 109 Note that i has the value 0 in the first loop, and so the value added to the expenses array is n 1 After assigning values to individual array elements, you can refer to those elements directly For instance, the following code accesses the seventh array element and assigns it to a variable, for which, from expenses preceding initialization, you know the value is 106
float x = expenses[7];
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