iPhone "슬라이드하여 잠금 해제"애니메이션

iPhone "슬라이드하여 잠금 해제"애니메이션

---

Apple이 "슬라이드하여 잠금 해제"(또한 "슬라이드하여 전원 끄기"도 동일한 예) 애니메이션을 구현 한 방법에 대한 아이디어가 있습니까?

나는 일종의 애니메이션 마스크에 대해 생각했지만 성능상의 이유로 iPhone OS에서는 마스킹을 사용할 수 없습니다.

사용했을 수있는 비공개 API 효과 (예 : SuckEffect)가 있습니까? 스포트라이트 유형의 효과? 핵심 애니메이션 문제?

편집 : 확실히 일련의 스틸이 아닙니다. 나는 plist 값이나 무언가를 편집하고 탈옥 아이폰에서 문자열을 사용자 정의하는 예를 보았습니다.

---

Core Animation을 사용하여 텍스트를 표시하는 레이어의 마스크 레이어에 애니메이션을 적용하여 쉽게 수행 할 수 있습니다.

일반 UIViewController ( View 기반 애플리케이션 프로젝트 템플릿을 기반 으로하는 새로운 Xcode 프로젝트로 시작할 수 있음)에서이를 시도 하거나 여기에서 Xcode 프로젝트를 가져옵니다 .

이 CALayer.mask속성은 iPhone OS 3.0 이상에서만 사용할 수 있습니다.

- (void)viewDidLoad 
{
  self.view.layer.backgroundColor = [[UIColor blackColor] CGColor];

  UIImage *textImage = [UIImage imageNamed:@"SlideToUnlock.png"];
  CGFloat textWidth = textImage.size.width;
  CGFloat textHeight = textImage.size.height;

  CALayer *textLayer = [CALayer layer];
  textLayer.contents = (id)[textImage CGImage];
  textLayer.frame = CGRectMake(10.0f, 215.0f, textWidth, textHeight);

  CALayer *maskLayer = [CALayer layer];

  // Mask image ends with 0.15 opacity on both sides. Set the background color of the layer
  // to the same value so the layer can extend the mask image.
  maskLayer.backgroundColor = [[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.15f] CGColor];
  maskLayer.contents = (id)[[UIImage imageNamed:@"Mask.png"] CGImage];

  // Center the mask image on twice the width of the text layer, so it starts to the left
  // of the text layer and moves to its right when we translate it by width.
  maskLayer.contentsGravity = kCAGravityCenter;
  maskLayer.frame = CGRectMake(-textWidth, 0.0f, textWidth * 2, textHeight);

  // Animate the mask layer's horizontal position
  CABasicAnimation *maskAnim = [CABasicAnimation animationWithKeyPath:@"position.x"];
  maskAnim.byValue = [NSNumber numberWithFloat:textWidth];
  maskAnim.repeatCount = HUGE_VALF;
  maskAnim.duration = 1.0f;
  [maskLayer addAnimation:maskAnim forKey:@"slideAnim"];

  textLayer.mask = maskLayer;
  [self.view.layer addSublayer:textLayer];

  [super viewDidLoad];
}

이 코드에서 사용하는 이미지는 다음과 같습니다.

---

레이어 마스크를 사용하는 또 다른 솔루션이지만 대신 손으로 그라디언트를 그리고 이미지가 필요하지 않습니다. 보기는 애니메이션이있는보기이고, 투명도는 투명도 (1 = 무의미한 투명도 없음)를 정의하는 0-1의 부동 소수점이며 gradientWidth는 원하는 그라디언트 너비입니다.

CAGradientLayer *gradientMask = [CAGradientLayer layer];
 gradientMask.frame = view.bounds;
CGFloat gradientSize = gradientWidth / view.frame.size.width;
UIColor *gradient = [UIColor colorWithWhite:1.0f alpha:transparency];
NSArray *startLocations = @[[NSNumber numberWithFloat:0.0f], [NSNumber numberWithFloat:(gradientSize / 2)], [NSNumber numberWithFloat:gradientSize]];
NSArray *endLocations = @[[NSNumber numberWithFloat:(1.0f - gradientSize)], [NSNumber numberWithFloat:(1.0f -(gradientSize / 2))], [NSNumber numberWithFloat:1.0f]];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"locations"];

gradientMask.colors = @[(id)gradient.CGColor, (id)[UIColor whiteColor].CGColor, (id)gradient.CGColor];
gradientMask.locations = startLocations;
gradientMask.startPoint = CGPointMake(0 - (gradientSize * 2), .5);
gradientMask.endPoint = CGPointMake(1 + gradientSize, .5);

view.layer.mask = gradientMask;

animation.fromValue = startLocations;
animation.toValue = endLocations;
animation.repeatCount = HUGE_VALF;
animation.duration  = 3.0f;

[gradientMask addAnimation:animation forKey:@"animateGradient"];

SWIFT 버전 :

let transparency:CGFloat = 0.5
let gradientWidth: CGFloat = 40

let gradientMask = CAGradientLayer()
gradientMask.frame = swipeView.bounds
let gradientSize = gradientWidth/swipeView.frame.size.width
let gradient = UIColor(white: 1, alpha: transparency)
let startLocations = [0, gradientSize/2, gradientSize]
let endLocations = [(1 - gradientSize), (1 - gradientSize/2), 1]
let animation = CABasicAnimation(keyPath: "locations")

gradientMask.colors = [gradient.CGColor, UIColor.whiteColor().CGColor, gradient.CGColor]
gradientMask.locations = startLocations
gradientMask.startPoint = CGPointMake(0 - (gradientSize*2), 0.5)
gradientMask.endPoint = CGPointMake(1 + gradientSize, 0.5)

swipeView.layer.mask = gradientMask

animation.fromValue = startLocations
animation.toValue = endLocations
animation.repeatCount = HUGE
animation.duration = 3

gradientMask.addAnimation(animation, forKey: "animateGradient")

스위프트 3

fileprivate func addGradientMaskToView(view:UIView, transparency:CGFloat = 0.5, gradientWidth:CGFloat = 40.0) {        
    let gradientMask = CAGradientLayer()
    gradientMask.frame = view.bounds
    let gradientSize = gradientWidth/view.frame.size.width
    let gradientColor = UIColor(white: 1, alpha: transparency)
    let startLocations = [0, gradientSize/2, gradientSize]
    let endLocations = [(1 - gradientSize), (1 - gradientSize/2), 1]
    let animation = CABasicAnimation(keyPath: "locations")

    gradientMask.colors = [gradientColor.cgColor, UIColor.white.cgColor, gradientColor.cgColor]
    gradientMask.locations = startLocations as [NSNumber]?
    gradientMask.startPoint = CGPoint(x:0 - (gradientSize * 2), y: 0.5)
    gradientMask.endPoint = CGPoint(x:1 + gradientSize, y: 0.5)

    view.layer.mask = gradientMask

    animation.fromValue = startLocations
    animation.toValue = endLocations
    animation.repeatCount = HUGE
    animation.duration = 3

    gradientMask.add(animation, forKey: nil)
}

---

당신은 사용할 수 있습니다 kCGTextClip클리핑 경로를 설정 그리기 모드를 다음 그라데이션 채우기.

// Get Context
CGContextRef context = UIGraphicsGetCurrentContext();
// Set Font
CGContextSelectFont(context, "Helvetica", 24.0, kCGEncodingMacRoman);
// Set Text Matrix
CGAffineTransform xform = CGAffineTransformMake(1.0,  0.0,
                                                0.0, -1.0,
                                                0.0,  0.0);
CGContextSetTextMatrix(context, xform);
// Set Drawing Mode to set clipping path
CGContextSetTextDrawingMode (context, kCGTextClip);
// Draw Text
CGContextShowTextAtPoint (context, 0, 20, "Gradient", strlen("Gradient")); 
// Calculate Text width
CGPoint textEnd = CGContextGetTextPosition(context);
// Generate Gradient locations & colors
size_t num_locations = 3;
CGFloat locations[3] = { 0.3, 0.5, 0.6 };
CGFloat components[12] = { 
    1.0, 1.0, 1.0, 0.5,
    1.0, 1.0, 1.0, 1.0,
    1.0, 1.0, 1.0, 0.5,
};
// Load Colorspace
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
// Create Gradient
CGGradientRef gradient = CGGradientCreateWithColorComponents (colorspace, components,
                                                              locations, num_locations);
// Draw Gradient (using clipping path
CGContextDrawLinearGradient (context, gradient, rect.origin, textEnd, 0);
// Cleanup (exercise for reader)

NSTimer를 설정하고 위치의 값을 변경하거나 CoreAnimation을 사용하여 동일하게 수행하십시오.

---

UILabel의 카테고리로 Pascal에서 제공 한 코드를 추가하여 이러한 방식으로 모든 UILabel을 애니메이션 할 수 있습니다. 여기에 코드가 있습니다. 배경색 등을 위해 일부 매개 변수를 변경해야 할 수도 있습니다. Pascal이 답변에 삽입 한 것과 동일한 마스크 이미지를 사용합니다.

//UILabel+FSHighlightAnimationAdditions.m
#import "UILabel+FSHighlightAnimationAdditions.h"
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@implementation UILabel (FSHighlightAnimationAdditions)

- (void)setTextWithChangeAnimation:(NSString*)text
{
    NSLog(@"value changing");
    self.text = text;
    CALayer *maskLayer = [CALayer layer];

    // Mask image ends with 0.15 opacity on both sides. Set the background color of the layer
    // to the same value so the layer can extend the mask image.
    maskLayer.backgroundColor = [[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.15f] CGColor];
    maskLayer.contents = (id)[[UIImage imageNamed:@"Mask.png"] CGImage];

    // Center the mask image on twice the width of the text layer, so it starts to the left
    // of the text layer and moves to its right when we translate it by width.
    maskLayer.contentsGravity = kCAGravityCenter;
    maskLayer.frame = CGRectMake(self.frame.size.width * -1, 0.0f, self.frame.size.width * 2, self.frame.size.height);

    // Animate the mask layer's horizontal position
    CABasicAnimation *maskAnim = [CABasicAnimation animationWithKeyPath:@"position.x"];
    maskAnim.byValue = [NSNumber numberWithFloat:self.frame.size.width];
    maskAnim.repeatCount = 1e100f;
    maskAnim.duration = 2.0f;
    [maskLayer addAnimation:maskAnim forKey:@"slideAnim"];

    self.layer.mask = maskLayer;
}

@end

//UILabel+FSHighlightAnimationAdditions.h
#import <Foundation/Foundation.h>
@interface UILabel (FSHighlightAnimationAdditions)

- (void)setTextWithChangeAnimation:(NSString*)text;

@end

---

너무 신선하지는 않지만 유용 할 것입니다

#define MM_TEXT_TO_DISPLAY          @"default"

#define MM_FONT             [UIFont systemFontOfSize:MM_FONT_SIZE]
#define MM_FONT_SIZE            25
#define MM_FONT_COLOR           [[UIColor darkGrayColor] colorWithAlphaComponent:0.75f];

#define MM_SHADOW_ENABLED           NO
#define MM_SHADOW_COLOR         [UIColor grayColor]
#define MM_SHADOW_OFFSET            CGSizeMake(-1,-1)


#define MM_CONTENT_EDGE_INSETS_TOP      0
#define MM_CONTENT_EDGE_INSETS_LEFT     10
#define MM_CONTENT_EDGE_INSETS_BOTTON   0
#define MM_CONTENT_EDGE_INSETS_RIGHT    10
#define MM_CONTENT_EDGE_INSETS          UIEdgeInsetsMake(MM_CONTENT_EDGE_INSETS_TOP, MM_CONTENT_EDGE_INSETS_LEFT, MM_CONTENT_EDGE_INSETS_BOTTON, MM_CONTENT_EDGE_INSETS_RIGHT)

#define MM_TEXT_ALIGNMENT           UITextAlignmentCenter
#define MM_BACKGROUND_COLOR         [UIColor clearColor]

#define MM_TIMER_INTERVAL           0.05f
#define MM_HORIZONTAL_SPAN          5


@interface MMAnimatedGradientLabel : UILabel {  

    NSString *textToDisplay;
    int text_length;

    CGGradientRef gradient;

    int current_position_x;
    NSTimer *timer;

    CGPoint alignment;

    CGGlyph *_glyphs;
}

- (id)initWithString:(NSString *)_string;

- (void)startAnimation;
- (void)toggle;
- (BOOL)isAnimating;

@end

#define RGB_COMPONENTS(r, g, b, a)  (r) / 255.0f, (g) / 255.0f, (b) / 255.0f, (a)

@interface MMAnimatedGradientLabel (Private)
- (CGRect)calculateFrame;
@end


@implementation MMAnimatedGradientLabel

// Missing in standard headers.
extern void CGFontGetGlyphsForUnichars(CGFontRef, const UniChar[], const CGGlyph[], size_t);

- (id)init {
    textToDisplay = MM_TEXT_TO_DISPLAY;
    return [self initWithFrame:[self calculateFrame]];
}

- (id)initWithString:(NSString *)_string {
    textToDisplay = _string;
    return [self initWithFrame:[self calculateFrame]];
}

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

        // set default values
        //
        self.textAlignment      = MM_TEXT_ALIGNMENT;
        self.backgroundColor    = MM_BACKGROUND_COLOR;
        self.font               = MM_FONT;
        self.text               = textToDisplay;
        self.textColor          = MM_FONT_COLOR;

        if (MM_SHADOW_ENABLED) {
            self.shadowColor        = MM_SHADOW_COLOR;
            self.shadowOffset       = MM_SHADOW_OFFSET;
        }

        text_length = -1;

        CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
        CGFloat colors[] =
        {       
            RGB_COMPONENTS(255.0, 255.0, 255.0, 0.00),
//          RGB_COMPONENTS(255.0, 255.0, 255.0, 0.15),
            RGB_COMPONENTS(255.0, 255.0, 255.0, 0.95),
//          RGB_COMPONENTS(255.0, 255.0, 255.0, 0.15),
            RGB_COMPONENTS(255.0, 255.0, 255.0, 0.00)
        };

        gradient = CGGradientCreateWithColorComponents(rgb, colors, NULL, sizeof(colors)/(sizeof(colors[0])*4));
        CGColorSpaceRelease(rgb);

        current_position_x = -(frame.size.width/2);// - MM_CONTENT_EDGE_INSETS.left - MM_CONTENT_EDGE_INSETS.right); 
    }

    return self;
}

- (CGRect)calculateFrame {
    CGSize size = [textToDisplay sizeWithFont:MM_FONT];
    NSLog(@"size: %f, %f", size.width, size.height);
    return CGRectMake(0, 0, size.width + MM_CONTENT_EDGE_INSETS.left + MM_CONTENT_EDGE_INSETS.right, size.height + MM_CONTENT_EDGE_INSETS.top + MM_CONTENT_EDGE_INSETS.bottom);
}

- (void)tick:(NSTimer*)theTimer {
    if (current_position_x < self.frame.size.width)
        current_position_x = current_position_x + MM_HORIZONTAL_SPAN;
    else
        current_position_x = -(self.frame.size.width/2); // - MM_CONTENT_EDGE_INSETS.left - MM_CONTENT_EDGE_INSETS.right);

    [self setNeedsDisplay]; 
}

- (void)startAnimation {    
    timer = [[NSTimer alloc] initWithFireDate:[NSDate date] 
                                     interval:MM_TIMER_INTERVAL
                                       target:self 
                                     selector:@selector(tick:)
                                     userInfo:nil
                                      repeats:YES];

    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}

- (void)toggle {

    if (!timer) {
        timer = [[NSTimer alloc] initWithFireDate:[NSDate date] 
                                         interval:MM_TIMER_INTERVAL
                                           target:self 
                                         selector:@selector(tick:)
                                         userInfo:nil
                                          repeats:YES];

        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
    } else {
        [timer invalidate];
        [timer release];
        timer = nil;

        current_position_x = -(self.frame.size.width/2);
        [self setNeedsDisplay]; 
    }
}

- (BOOL)isAnimating {

    if (timer) 
        return YES;
    else
        return NO;
}

- (void)drawRect:(CGRect)rect {
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    // Get drawing font.
    CGFontRef font = CGFontCreateWithFontName((CFStringRef)[[self font] fontName]);
    CGContextSetFont(ctx, font);
    CGContextSetFontSize(ctx, [[self font] pointSize]);

    // Calculate text drawing point only first time
    // 
    if (text_length == -1) {    

        // Transform text characters to unicode glyphs.
        text_length = [[self text] length];
        unichar chars[text_length];
        [[self text] getCharacters:chars range:NSMakeRange(0, text_length)];

        _glyphs = malloc(sizeof(CGGlyph) * text_length);
        for (int i=0; i<text_length;i ++)
            _glyphs[i] = chars[i] - 29;

        // Measure text dimensions.
        CGContextSetTextDrawingMode(ctx, kCGTextInvisible); 
        CGContextSetTextPosition(ctx, 0, 0);
        CGContextShowGlyphs(ctx, _glyphs, text_length);
        CGPoint textEnd = CGContextGetTextPosition(ctx);

        // Calculate text drawing point.        
        CGPoint anchor = CGPointMake(textEnd.x * (-0.5), [[self font] pointSize] * (-0.25));  
        CGPoint p = CGPointApplyAffineTransform(anchor, CGAffineTransformMake(1, 0, 0, -1, 0, 1));

        if ([self textAlignment] == UITextAlignmentCenter) 
            alignment.x = [self bounds].size.width * 0.5 + p.x;
        else if ([self textAlignment] == UITextAlignmentLeft) 
            alignment.x = 0;
        else 
            alignment.x = [self bounds].size.width - textEnd.x;

        alignment.y = [self bounds].size.height * 0.5 + p.y;
    }

    // Flip back mirrored text.
    CGContextSetTextMatrix(ctx, CGAffineTransformMakeScale(1, -1));

    // Draw shadow.
    CGContextSaveGState(ctx);
    CGContextSetTextDrawingMode(ctx, kCGTextFill);
    CGContextSetFillColorWithColor(ctx, [[self textColor] CGColor]);
    CGContextSetShadowWithColor(ctx, [self shadowOffset], 0, [[self shadowColor] CGColor]);
    CGContextShowGlyphsAtPoint(ctx, alignment.x, alignment.y, _glyphs, text_length);
    CGContextRestoreGState(ctx);

    // Draw text clipping path.
    CGContextSetTextDrawingMode(ctx, kCGTextClip);
    CGContextShowGlyphsAtPoint(ctx, alignment.x, alignment.y, _glyphs, text_length);

    // Restore text mirroring.
    CGContextSetTextMatrix(ctx, CGAffineTransformIdentity);

    if ([self isAnimating]) {
        // Fill text clipping path with gradient.
        CGPoint start = CGPointMake(rect.origin.x + current_position_x, rect.origin.y);
        CGPoint end = CGPointMake(rect.size.width/3*2 + current_position_x, rect.origin.y);

        CGContextDrawLinearGradient(ctx, gradient, start, end, 0);
    }
}


- (void) dealloc {
    free(_glyphs);
    [timer invalidate];
    [timer release];

    CGGradientRelease(gradient);
    [super dealloc];
}

---

클리핑 그래디언트 레시피에 대해 rpetrich에게 감사드립니다. 저는 초보 iPhone 및 Cocoa 개발자이기 때문에 정말 기뻤습니다.

rpetrich의 방법을 사용하여 UIViewController 를 취소 하는 괜찮은 모양의 슬라이드를 구현했습니다 . 여기 에서 내 구현의 Xcode 프로젝트를 다운로드 할 수 있습니다 .

My implementation uses a repeating NSTimer. I was unable to figure out how use Core (or Gore) Animation to have the iPhone's graphics engine continuously move the highlighting. I think that could be done on OS X with CALayer mask layers, but mask layers are not supported on iPhone OS.

When I play with Apple's "Slide to Unlock" slider on my iPhone's home screen, I occasionally see the animation freeze. So I think Apple may be using a timer as well.

If anyone can figure out how to do a non-timer based implementation using CA or OpenGL, I would love to see it.

Thanks for the help!

---

I know, I am a bit late with the answer, but Facebook has great library Shimmer that implements exactly that effect.

---

I took the best from above solutions and created a neat method that does all for you:

- (void)createSlideToUnlockViewWithText:(NSString *)text
{
    UILabel *label = [[UILabel alloc] init];
    label.text = text;
    [label sizeToFit];
    label.textColor = [UIColor whiteColor];

    //Create an image from the label
    UIGraphicsBeginImageContextWithOptions(label.bounds.size, NO, 0.0);
    [[label layer] renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *textImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    CGFloat textWidth = textImage.size.width;
    CGFloat textHeight = textImage.size.height;

    CALayer *textLayer = [CALayer layer];
    textLayer.contents = (id)[textImage CGImage];
    textLayer.frame = CGRectMake(self.view.frame.size.width / 2 - textWidth / 2, self.view.frame.size.height / 2 - textHeight / 2, textWidth, textHeight);

    UIImage *maskImage = [UIImage imageNamed:@"Mask.png"];
    CALayer *maskLayer = [CALayer layer];
    maskLayer.backgroundColor = [[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.15] CGColor];
    maskLayer.contents = (id)maskImage.CGImage;
    maskLayer.contentsGravity = kCAGravityCenter;
    maskLayer.frame = CGRectMake(-textWidth - maskImage.size.width, 0.0, (textWidth * 2) + maskImage.size.width, textHeight);

    CABasicAnimation *maskAnimation = [CABasicAnimation animationWithKeyPath:@"position.x"];
    maskAnimation.byValue = [NSNumber numberWithFloat:textWidth + maskImage.size.width];
    maskAnimation.repeatCount = HUGE_VALF;
    maskAnimation.duration = 2.0;
    maskAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    [maskLayer addAnimation:maskAnimation forKey:@"slideAnimation"];

    textLayer.mask = maskLayer;
    self.slideToUnlockLayer = textLayer;
    [self.view.layer addSublayer:self.slideToUnlockLayer];
}

---

First, a HUGE thank you to marcio for his solution. This worked almost perfectly, saved me hours of effort, and made a huge splash in my app. My boss loved it. I owe you beer. Or several.

One small correction for iPhone 4 only. I mean the hardware itself, not just iOS 4. They changed the system font on the iPhone 4 from Helvetica (iPhone 3Gs and below) to Helvetic Neue. This caused the translation you're doing from character to glyphs to be off by exactly 4 spots. For example the string "fg" would appear as "bc". I fixed this by explicitly setting the font to "Helvetica" rather than using "systemFontofSize". Now it works like a charm.

Again...THANK YOU!

---

I uploaded to GitHub a mini project who helps with the “slide to unlock” animation.

https://github.com/GabrielMassana/GM_FSHighlightAnimationAdditions

The project have LTR, RTL, Up to Down and Down to Up animations and it is based in the posts:

Pascal Bourque: https://stackoverflow.com/a/2778232/1381708

cberkley: https://stackoverflow.com/a/5710097/1381708

Cheers

---

Maybe it's just a rendered-out animation - you know, a series of stills played one after another. Not necessarily a dynamic effect.

Update: Never mind, the video DrJokepu posted proved it's dynamically generated.

---

• Top: UILabel with opaque background and clear text
  • Clear text is rendered in drawRect: func through complicated masking process
• Middle: Worker View that is performing a repeating animation moving an image behind the top label
• Bottom: a UIView that you add the middle and top subview to in that order. Can be whatever color you want the text to be

https://github.com/jhurray/AnimatedLabelExample에서 예제를 볼 수 있습니다.

참고 URL : https://stackoverflow.com/questions/438046/iphone-slide-to-unlock-animation