試圖與CAAnimation和CATextLayer

Question

幻燈片文本

我試圖與CATextLayer一個以幻燈片文本，但它顯然不是工作：

功能animationDidStop:finished:被調用一次，但沒有爲flag值。

代碼（子類的NSView）：

#import "AppStatusItemView.h" 

#define DEFAULT_FRAME (NSMakeRect(0 , 0 , 80 , 20)) 

/* ============================================================================ 
MARK: - 
MARK: Private Interface 
=========================================================================== */ 
@interface AppStatusItemView (Private) 
- (void)updateLayer; 
- (CATextLayer *)makeTextLayer; 
- (CABasicAnimation *)makeMoveAnimation; 
@end 

/* ============================================================================ 
MARK: - 
MARK: Public Implementation 
=========================================================================== */ 
@implementation AppStatusItemView 
/* MARK: Init */ 
- (id)initWithText:(NSString *)pS { 
    self = [self initWithFrame:DEFAULT_FRAME]; 
    if(self != nil) { 
     _text = [pS retain]; 

     /* initialize view */ 
     [self updateLayer]; 
    } 
    return self; 
} 

- (void)dealloc { 
    [_text release]; 
    [_textLayer release]; 
    [super dealloc]; 
} 

/* MARK: Properties */ 
@synthesize text=_text; 
- (void)setText:(NSString *)pT { 
    if(![_text isEqualToString:pT]) { 
     [_text release]; 
     _text = [pT retain]; 

     [self updateLayer]; 
    } 
} 

/* MARK: Animation Delegate */ 
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { 
    if(flag) { 
     CABasicAnimation *myAnimation; 
     myAnimation = [self makeMoveAnimation]; 
     [myAnimation setDelegate:self]; 
     [_textLayer addAnimation:myAnimation forKey:@"slide"]; 
    } 
} 
@end 

/* ============================================================================ 
MARK: - 
MARK: Private Implementation 
=========================================================================== */ 
@implementation AppStatusItemView (Private) 
- (void)updateLayer { 
    CABasicAnimation *myAnimation; 
    CATextLayer *myLayer; 

    myLayer = [self makeTextLayer]; 
    myAnimation = [self makeMoveAnimation]; 

    [_textLayer removeAllAnimations]; 
    [_textLayer removeFromSuperlayer]; 

    [_textLayer release]; 
    _textLayer = [myLayer retain]; 
    [[self layer] addSublayer:_textLayer]; 

    [myAnimation setDelegate:self]; 
    [_textLayer addAnimation:myAnimation forKey:@"slide"]; 
} 

- (CATextLayer *)makeTextLayer { 
    CATextLayer *layer; 
    NSString *myString; 
    CGRect myFrame; 
    CGPoint myPosition; 

    myString = _text; 
    layer = [[CATextLayer layer] retain]; 
    [layer setString:myString]; 
    myFrame.origin = CGPointZero; 
    myFrame.size = NSSizeToCGSize([myString sizeWithAttributes:nil]); 
    [layer setFrame:myFrame]; 

    myPosition.y = 1.0; 
    myPosition.x = [self bounds].size.width + 2.0; 
    [layer setPosition:myPosition]; 

    return [layer autorelease]; 
} 

- (CABasicAnimation *)makeMoveAnimation { 
    CABasicAnimation *animation; 
    CGPoint myPoint; 

    myPoint.y = 1.0; 
    animation = [CABasicAnimation animationWithKeyPath:@"position"]; 
    myPoint.x = [self bounds].size.width + 1.0; 
    [animation setFromValue:[NSValue valueWithPoint:myPoint]]; 
    myPoint.x = -[_textLayer bounds].size.width - 1.0; 
    [animation setToValue:[NSValue valueWithPoint:myPoint]]; 
    [animation setTimingFunction: 
    [CAMediaTimingFunction 
     functionWithName:kCAMediaTimingFunctionEaseInEaseOut]]; 

    [animation setDuration:5.0]; 

    return animation; 
} 
@end 

謝謝你在前進，
ief2

Answer 1

我已經改變了代碼，但沒有調試以前的代碼。

新實施的，如果有人想看看它：

#import "AppStatusItemView.h" 

#define DEFAULT_FRAME (NSMakeRect(0 , 0 , 140 , 20)) 
#define SLIDE_SPEED (30.0) /* points per second */ 

/* ============================================================================ 
MARK: - 
MARK: Private Interface 
=========================================================================== */ 
@interface AppStatusItemView (Private) 
- (void)slide; 
- (NSTimeInterval)intervalWithWidth:(CGFloat)w speed:(CGFloat)s; 
@end 

/* ============================================================================ 
MARK: - 
MARK: Public Implementation 
=========================================================================== */ 
@implementation AppStatusItemView 
/* MARK: Init */ 
- (id)initWithText:(NSString *)pS { 
    self = [self initWithFrame:DEFAULT_FRAME]; 
    if(self != nil) { 
     _text = [pS retain]; 

     /* Create root layer */ 
     { 
      //CGColorRef myColor = CGColorCreateGenericRGB(0.5 , 0.0 , 0.0 , 0.5); 
      _rootLayer = [[CAScrollLayer layer] retain]; 
      [_rootLayer setFrame:NSRectToCGRect([self bounds])]; 
      //[_rootLayer setBackgroundColor:myColor]; 
      [self setWantsLayer:YES]; 
      [self setLayer:_rootLayer]; 
      //CGColorRelease(myColor); 
     } 

     /* Create text layer */ 
     { 
      CGColorRef myColor = CGColorCreateGenericRGB(0.0 , 0.0 , 0.0 , 1.0); 
      _textLayer = [[CATextLayer layer] retain]; 
      [_textLayer setFontSize:12.0]; 
      [_textLayer setForegroundColor:myColor]; 
      [self slide]; 
      CGColorRelease(myColor); 
     } 

    } 
    return self; 
} 

- (void)dealloc { 
    [_text release]; 
    [_textLayer release]; 
    [_rootLayer release]; 
    [super dealloc]; 
} 

/* MARK: Properties */ 
@synthesize text=_text; 
- (void)setText:(NSString *)pT { 
    if(![_text isEqualToString:pT]) { 
     [_text release]; 
     _text = [pT retain]; 
    } 
} 

/* MARK: Animation Delegate */ 
- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { 
    if(flag) { 
     [self slide]; 
    } 
} 
@end 

/* ============================================================================ 
MARK: - 
MARK: Private Implementation 
=========================================================================== */ 
@implementation AppStatusItemView (Private) 
- (void)slide { 
    NSRect startFrame, endFrame; 
    NSPoint startPosititon, endPosition; 
    NSSize textSize; 

    [_textLayer removeFromSuperlayer]; 

    /* Set start frame and position */ 
    { 
     NSDictionary *attributes; 
     NSFont *font; 
     CGFloat h; 

     font = [NSFont fontWithName:@"Helvetica" 
           size:12.0]; 
     attributes = [NSDictionary dictionaryWithObject:font 
               forKey:NSFontAttributeName]; 
     textSize = [_text sizeWithAttributes:attributes]; 

     h = ([self bounds].size.height - textSize.height)/2.0; 
     startFrame = NSMakeRect([self bounds].size.width, 
           h, textSize.width , textSize.height); 
     startPosititon.x = [self bounds].size.width + textSize.width/2.0; 
     startPosititon.y = [self bounds].size.height/2.0; 

     [_textLayer setString:_text]; 
     [_textLayer setFrame:NSRectToCGRect(startFrame)]; 
     [_textLayer setPosition:NSPointToCGPoint(startPosititon)]; 
    } 

    /* Slide to end position */ 
    { 
     CGFloat h; 
     CABasicAnimation *animation; 

     h = ([self bounds].size.height - textSize.height)/2.0; 
     endFrame = NSMakeRect(0.0 - textSize.width, h, 
           textSize.width, 
           textSize.height); 
     endPosition.x = -textSize.width/2.0; 
     endPosition.y = [self bounds].size.height/2.0; 

     animation = [CABasicAnimation animationWithKeyPath:@"position"]; 
     [animation setFromValue: 
     [NSValue valueWithPoint:startPosititon]]; 
     [animation setToValue: 
     [NSValue valueWithPoint:endPosition]]; 
     [animation setDelegate:self]; 
     [animation setDuration: 
     [self intervalWithWidth:textSize.width speed:SLIDE_SPEED]]; 
     [animation setTimingFunction: 
     [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]]; 

     [_textLayer addAnimation:animation forKey:@"slide"]; 

     //p[_textLayer setFrame:NSRectToCGRect(endFrame)]; 
     [_textLayer setPosition:NSPointToCGPoint(endPosition)]; 
    } 

    [_rootLayer addSublayer:_textLayer]; 
} 

- (NSTimeInterval)intervalWithWidth:(CGFloat)w speed:(CGFloat)s { 
    return (NSTimeInterval)(w/s); 
} 
@end