ios - 使用下一个和上一个UIButton切换UITextView/UILabel中的不同文本

Question

假设我有5条文字。我想使用UITextView或UILabel来显示它。我有一个下一个和上一个按钮，以帮助我循环浏览。解决此问题的最佳方法是什么？

 NSString *text1 = @"Hello World 1"
 NSString *text2 = @"Hello World 2"
 NSString *text3 = @"Hello World 3"
 NSString *text4 = @"Hello World 4"
 NSString *text5 = @"Hello World 5"

Answer 1

这个解决方案可能很好

在.h文件中

UIButton *nextButton;
UIButton *backButton;
UILabel *textLabel;
NSArray *textStr;
int counter;

在.m文件中

- (void)viewDidLoad

{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    counter=0;

    textStr = [[NSArray alloc] initWithObjects:@"Today is rainy", @"Today is sunnt", @"Today is bright", @"Today is gloomy",
    @"Today is beautifyl", nil];

    textLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 30, 200, 200)];
    textLabel.text= [NSString stringWithFormat:@"%@", [textStr objectAtIndex:0]];
    [self.view addSubview:textLabel];

    nextButton= [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [nextButton addTarget:self
               action:@selector(btnClicked:)
     forControlEvents:UIControlEventTouchDown];
    nextButton.tag=1;
    [nextButton setTitle:@"Next" forState:UIControlStateNormal];
    nextButton.frame = CGRectMake(120.0, 150, 80, 40.0);
    [self.view addSubview:nextButton];

    backButton= [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [backButton addTarget:self
                   action:@selector(btnClicked:)
         forControlEvents:UIControlEventTouchDown];
    backButton.tag=2;
    [backButton setTitle:@"Previous" forState:UIControlStateNormal];
    backButton.frame = CGRectMake(30.0, 150, 80.0, 40.0);
    [self.view addSubview:backButton];

}
-(void)btnClicked:(UIButton*)btn{



    if (btn.tag==1) {
        NSLog(@"%i", [textStr count]);
        if (counter<[textStr count]-1) {
        counter++;
        NSLog(@"%i", counter);

        textLabel.text= [NSString stringWithFormat:@"%@", [textStr objectAtIndex:counter]];
        }
    }
    else{
        if (counter>1) {
        counter--;
            textLabel.text= [NSString stringWithFormat:@"%@", [textStr objectAtIndex:counter]];
        }

    }

}