ios string concat and type conversion

gistfile1.m

- (IBAction)concatFields:(id)sender
{
    //NSString* s = field1.text;
    //label.text = [s stringByAppendingString:field2.text];


    float f1 = field1.text.floatValue;
    float f2 = field2.text.floatValue;
    NSNumber* n = [NSNumber numberWithFloat:f1*f2];
    label.text = n.stringValue;
}

- (IBAction)segmentSelected
{
    NSNumber *n = [NSNumber numberWithInteger:[segment selectedSegmentIndex]];
    NSString *s = [n stringValue];
    [label setText:s];
}

- (IBAction)sliding
{
    NSNumber *n = [NSNumber numberWithFloat:[slider value]];
    label.text = [n stringValue];
}

- (IBAction)switching
{
    BOOL b = [theswitch isOn];   
}

- (IBAction)stepping
{
    NSNumber *n1 = [NSNumber numberWithDouble:[stepper value]];
    [label setText:[n1 stringValue]];
}

@interface TMViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextView *text;
@property (strong, nonatomic) IBOutlet UIWebView *web;
@property (strong, nonatomic) IBOutlet UIImageView *imageview;
@property (strong, nonatomic) IBOutlet UILabel *label;
- (IBAction)button:(id)sender forEvent:(UIEvent *)event;
- (IBAction)segment:(id)sender forEvent:(UIEvent *)event;

@end


- (IBAction)segment:(id)sender forEvent:(UIEvent *)event {
    NSInteger i = [sender selectedSegmentIndex];
    NSNumber *n = [NSNumber numberWithInt:i];
    label.text = [n stringValue];
    label.text = [text text];
    
    switch ([sender selectedSegmentIndex]) {
        case 0:
            [imageview setImage:[UIImage imageNamed:@"sexy.jpg"]];
            break;
        case 1:
            [imageview setImage:[UIImage imageNamed:@"objc.png"]];
            break;
        case 2:
            [imageview setImage:[UIImage imageNamed:@"love.jpg"]];
            break;
        case 3:
            [web loadRequest:
             [NSURLRequest requestWithURL:
              [NSURL URLWithString:@"http://google.com"]]];
            break;
        default:
            break;
    }
}

@interface TMPickerViewController : UIViewController
<UIPickerViewDataSource, UIPickerViewDelegate>
{
    NSMutableArray *list;
}

@property (weak, nonatomic) IBOutlet UILabel *label;
@property (weak, nonatomic) IBOutlet UIPickerView *picker;
@end


@implementation TMPickerViewController
@synthesize label;
@synthesize picker;

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    return [list count];
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [list objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {    
    [label setText:[list objectAtIndex:row]];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    list = [[NSMutableArray alloc] init];
    [list addObject:@"A"];
    [list addObject:@"B"];
    [list addObject:@"C"];
}

- (void)viewDidUnload {
    [self setLabel:nil];
    [self setPicker:nil];
    
    [super viewDidUnload];
}
@end


- (IBAction)satellite:(id)sender forEvent:(UIEvent *)event {
    [map setMapType:MKMapTypeSatellite];
}

- (IBAction)datepick:(id)sender forEvent:(UIEvent *)event {
    
    NSDate *pickerDate = [sender date];
    NSString *selectionString = [[NSString alloc] initWithFormat:@"%@",
                                 [pickerDate description]];
    label.text = selectionString;    
}