如何在我的应用程序中实现代码在iphone

Question

我只想在我的应用程序中有一个代码， 我不知道要实现代码请告诉我。

感谢

Answer 1

的“北京时间”假设你的意思是水平滚动的文字：

一个股票基本上是由具有其x坐标连续改变移动文本字符串。检查如何显示在标签上这个简单的教程：

http://knol.google.com/k/iphone-sdk-helloworld

后来的后来，你可以通过使用一个NSTimer调用更新标签X坐标连续的方法制作动画。

Answer 2

您需要做的一切都在SDK中，根本不需要自定义。我没有检查这一点，但你可以尝试以下方法：

#import <UIKit/UIKit.h> 


@interface TickerScrollView : UIScrollView { 

    UILabel *textLabel; 

} 

- (void)displayText:(NSString *)string; 
- (void)clearTicker; 

@property (nonatomic, retain, readwrite) UILabel *textLabel; 

@end 

//// 


#import "TickerScrollView.h" 

@interface TickerScrollView() 

- (void)initialiseTextLabel; 
- (void)clearTicker; 

- (void)beginAnimation; 

@end 


@implementation TickerScrollView 

- (id)initWithFrame:(CGRect)frame { 
    if ((self = [super initWithFrame:frame])) { 

     // Initialization code 
     [self setFrame: frame]; 

     [self setBounces: NO]; 
     [self setUserInteractionEnabled:NO]; 

     [self setShowsVerticalScrollIndicator:NO]; 
     [self setShowsHorizontalScrollIndicator:NO]; 

     [self initialiseTextLabel]; 

    } 
    return self; 
} 

- (void)initialiseTextLabel { 

    textLabel = [[[UILabel alloc] initWithFrame:self.bounds] autorelease]; 
    [textLabel setTextAlignment:UITextAlignmentLeft]; 
    [textLabel setNumberOfLines:1]; 
    [textLabel sizeToFit]; 

    [self addSubview:textLabel]; 
    [self sendSubviewToBack:textLabel]; 

    [self setScrollEnabled:YES]; 

} 

- (void)displayText:(NSString *)string { 

    [self clearTicker]; 

    [textLabel setText:string]; 
    [textLabel sizeToFit]; 

    [self setContentSize:textLabel.frame.size]; 

    [self beginAnimation]; 

} 

- (void)clearTicker { 

    [textLabel setText:@""]; 
    [textLabel sizeToFit]; 

    CGPoint origin = CGPointMake(0, 0); 
    [self setContentOffset:origin]; 

} 

- (void)beginAnimation { 

    CGFloat text_width = textLabel.frame.size.width; 
    CGFloat display_width = self.frame.size.width; 

    if (text_width > display_width) { 

     CGPoint origin = CGPointMake(0, 0); 
     [self setContentOffset:origin]; 

     CGPoint terminal_origin = CGPointMake(textLabel.frame.size.width - self.frame.size.width, textLabel.frame.origin.y); 
     float duration = (text_width - display_width)/50; 

     [UIView beginAnimations:nil context:NULL]; 

     [UIView setAnimationCurve:UIViewAnimationCurveLinear]; 
     [UIView setAnimationDelay:1.0]; 
     [UIView setAnimationDuration:duration]; 

     [self setContentOffset:terminal_origin]; 

     [UIView commitAnimations]; 

    } 

} 

/* 
// Only override drawRect: if you perform custom drawing. 
// An empty implementation adversely affects performance during animation. 
- (void)drawRect:(CGRect)rect { 
    // Drawing code 
} 
*/ 

- (void)dealloc { 

    [textLabel release]; 
    [super dealloc]; 

} 

@synthesize textLabel; 

@end