Question

合适的人，我是xcode和iPhone SDK的新手，但是在过去的几周里一直保持着它，慢慢地到达那里，但是我刚刚开始构建一个使用UIPickerView的应用程序，到目前为止我有一个具有7个值的选择器。当选择一个值时，它会显示在一个标签内......非常简单的东西。但到目前为止，我找不到任何教程，其中包括如何加载标准UIImageView然后我可以根据选择器中选择的内容交换图像。（每个人的马克杯镜头）你们现在在哪里，我可以找到一些帮助这或指向我正确的方向.....

到目前为止，我的代码非常标准：

我在.h文件中的

： -

#import <UIKit/UIKit.h>

@interface Team : UIViewController
{
    IBOutlet UIPickerView *pickerView;
    NSMutableArray *list;
    IBOutlet UILabel *pickerLabel;
    IBOutlet UIImage *pickerImage;
}
@end

在.m文件中我有： -

#import "Team.h"

@implementation Team

-(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{

    NSString *string = [NSString stringWithFormat:@"You Selected %@", [list objectAtIndex:row]];
    pickerLabel.text = string;
}



- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    list = [[NSMutableArray alloc]init];
    [list addObject:@"Doug Filder"];
    [list addObject:@"Chris Savage"];
    [list addObject:@"Nick Bennett"];
    [list addObject:@"Aimee Vacher"];
    [list addObject:@"Brandy Cardwell"];
    [list addObject:@"Jon West"];
    [list addObject:@"Dan Parsons"];

    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

Answer 1

您可以使用NSDictionary来存储人员的姓名并关联文件名，例如：

首先，将UIImage更改为UIImageView：

@interface Team : UIViewController
{
    IBOutlet UIPickerView *pickerView;
    NSMutableArray *list;
    NSMutableDictionary *filenames;
    IBOutlet UILabel *pickerLabel;
    IBOutlet UIImageView *pickerImage;
}
@end

然后，这是你如何将图像加载到其中：

- (void)viewDidLoad {
    list = [[NSMutableArray alloc]init];
    [list addObject:@"Doug Filder"];
    [list addObject:@"Chris Savage"];
    [list addObject:@"Nick Bennett"];
    [list addObject:@"Aimee Vacher"];
    [list addObject:@"Brandy Cardwell"];
    [list addObject:@"Jon West"];
    [list addObject:@"Dan Parsons"];

    filenames = [[NSMutableDictionary alloc] init];
    [filenames setObject:@"DougFilder.jpg" forKey:@"Doug Filder"];
    [filenames setObject:@"ChrisSavage.jpg" forKey:@"Chris Savage"];
    [filenames setObject:@"NickBennett.jpg" forKey:@"Nick Bennett"];
    [filenames setObject:@"AimeeVacher.jpg" forKey:@"Aimee Vacher"];
    [filenames setObject:@"BrandyCardwell.jpg" forKey:@"Brandy Cardwell"];
    [filenames setObject:@"JonWest.jpg" forKey:@"Jon West"];
    [filenames setObject:@"DanParsons.jpg" forKey:@"Dan Parsons"];
}

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

}

-(void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    NSString *string = [NSString stringWithFormat:@"You Selected %@", [list objectAtIndex:row]];
    pickerLabel.text = string;

    NSString *filename = [filenames objectForKey:[list objectAtIndex:row]];
    [pickerImage setImage:[UIImage imageNamed:filename]];
}

希望这有帮助！：）

Answer 2

只需替换此

  -(void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

        NSString *string = [NSString stringWithFormat:@"You Selected %@", [list objectAtIndex:row]];
        pickerLabel.text = string;
        pickerImage = [UIImage imageNamed:string];
    }

关于UIPickerView的Noob查询

2 个答案: