How to create 32 random UILabels rotation? - objective-c

Question

I'm working on creating a rotation of 32 names using UILabels. How would I random rotate all 32 names?

Answer 1

- (IBAction)buttonPressed
{
int randomInt = rand() % [nameArray count];
[nameLabel setText:[nameArray objectAtIndex:randomInt]]
}
In your .h file you must have:
IBOutlet UILabel *nameLabel;
EDIT
I built this project and here is the exact code I used:
This is the .h file:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
IBOutlet UILabel *nameLabel;
NSArray *nameArray;
}
- (IBAction)buttonPressed;
#end
This is the .m file:
#import "ViewController.h"
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
nameArray = [[NSArray alloc] initWithObjects:#"name1", #"name2", #"name3", #"name4", #"name5", #"name6", nil];
}
- (IBAction)buttonPressed
{
int randomInt = rand() % [nameArray count];
[nameLabel setText:[nameArray objectAtIndex:randomInt]];
}
- (void)dealloc
{
[super dealloc];
[nameArray release];
nameArray = nil;
}
#end
Make sure that both the UILabel and button actions are connected in interface builder.

Answer 2

#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
NSMutableArray *nameArray;
NSMutableArray *textFieldArray;
UIScrollView *scrollView;
}
- (IBAction)buttonPressed;
- (void)addTextFields:(int)count;
// Random sort function for the shuffle method
int randomSort(id obj1, id obj2, void *context );
#end
#import "ViewController.h"
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// If you want to pre load values
nameArray = [[NSMutableArray alloc] initWithObjects:#"name1", #"name2", #"name3", #"name4", #"name5", #"name6", nil];
// Initilize the array to contain all the textfields
textFieldArray = [[NSMutableArray alloc] init];
// inititlize and add the scrollview
scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
[self.view addSubview:scrollView];
// Create and add the button to randomize the fields
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setFrame:CGRectMake(self.view.frame.size.width/2 - 150, 20, 150, 50)];
[button addTarget:self action:#selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:#"Randomize" forState:UIControlStateNormal];
[scrollView addSubview:button];
// method to create any number of textfields (currently sending number of items in nameArray)
[self addTextFields:[nameArray count]];
}
- (void)addTextFields:(int)count
{
// adjust these to get the size and positions you like
#define X_POSITION 20
#define TEXT_FIELD_WIDTH 300
#define TEXT_FIELD_HEIGHT 50
// Where to place the first text field
int yPosition = 90;
for (int textFieldCount = 0; textFieldCount<count; textFieldCount++) {
//Create and add the text field
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(X_POSITION, yPosition, TEXT_FIELD_WIDTH, TEXT_FIELD_HEIGHT)];
[textField setTag:textFieldCount];
[scrollView addSubview:textField];
[textFieldArray addObject:textField];
[textField setText:[nameArray objectAtIndex:textFieldCount]];
// Where to place the next text field
yPosition += (TEXT_FIELD_HEIGHT + 20);
}
// set the scroll view content size so it will fit all the text fields
[scrollView setContentSize:CGSizeMake(self.view.frame.size.width, yPosition+TEXT_FIELD_HEIGHT+20)];
}
- (IBAction)buttonPressed
{
// release and remove everyting from the name array
[nameArray release];
nameArray = nil;
// reinitilize the name array
nameArray = [[NSMutableArray alloc] init];
// Loop through the textfields to get the names into the nameArray
for (int textFieldCount = 0; textFieldCount<[textFieldArray count]; textFieldCount++) {
[nameArray addObject:[[textFieldArray objectAtIndex:textFieldCount] text]];
}
// Randomly sort the names in the array
[nameArray sortUsingFunction:randomSort context:nil];
// Add the random names back into the text fields
for (int textFieldCount = 0; textFieldCount<[textFieldArray count]; textFieldCount++) {
[[textFieldArray objectAtIndex:textFieldCount] setText:[nameArray objectAtIndex:textFieldCount]];
}
}
int randomSort(id obj1, id obj2, void *context ) {
// returns random number -1 0 1
return (arc4random()%3 - 1);
}
- (void)dealloc
{
[super dealloc];
[nameArray release];
nameArray = nil;
}