iOS走马灯上下滚动显示文本

来源：互联网发布：android 移动网络状态编辑：程序博客网时间：2024/05/29 14:37

在网上找到的大部分都是横向的走马灯效果，就自己动手谢了一个上下滚动的。说的准确一点的话可能不算走马灯，文本是有停留的，每次显示一条。不停留连续的走马灯效果正在研究，后期补上。
TableViewCell调用

        NSArray * arr = @[@"qwer",@"12345",@"asdfg",@"54321",@"zxcvb",@"09877",@"567889"];        dynamicMessageTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:shoppersCell];        if (cell == nil) {            cell = [[dynamicMessageTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:shoppersCell dataArray:arr];        }        return cell;

Cell

#import "BTableViewCell.h"@interface dynamicMessageTableViewCell : BTableViewCell-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier dataArray:(NSArray *)titleArray;//-(void)info:(NSArray *)titleArray;@end

BBCyclingLabel

#import "dynamicMessageTableViewCell.h"#import "BBCyclingLabel.h"@interface dynamicMessageTableViewCell(){    BBCyclingLabel * _bbCyclingLable;    NSArray * _titleArr;    UITextField * _text;    int a;    int _msgCount;}@end@implementation dynamicMessageTableViewCell-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier dataArray:(NSArray *)titleArray{    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {        _text = [[UITextField alloc] initWithFrame:CGRectMake(80, 0, SCREEN_WIDTH-80, 30)];        _titleArr = [[NSArray alloc] init];        _titleArr = titleArray;        UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(20, 10, 50, 50)];        [imagev setImage:GetImage(@"icon_notice.png")];        [self addSubview:imagev];        [self createUI];    }    return self;}-(void)createUI{    _bbCyclingLable  = [[BBCyclingLabel alloc]initWithFrame:CGRectMake(80, 0, SCREEN_WIDTH-80, 30) andTransitionType:BBCyclingLabelTransitionEffectScrollUp];//    [_text addSubview:_bbCyclingLable];//    _text.borderStyle = UITextBorderStyleRoundedRect;//    [self addSubview:_text];    [self addSubview:_bbCyclingLable];    NSTimer *time = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(change) userInfo:nil repeats:YES];    [time fire];    a = 0;}-(void)info:(NSArray *)titleArray{    _titleArr = titleArray;}//数组中的内容仅供测试用，具体内容可以通过后台服务器获取或者写死（数据条数可以改变，我写的是3条）-(void)change{    a++;    if (0<=a && a<_titleArr.count) {        _bbCyclingLable.text = [_titleArr objectAtIndex:a];    }else{        a=0;        _bbCyclingLable.text = [_titleArr objectAtIndex:a];    }}

//// Copyright 2012 BiasedBit//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.//////  Created by Bruno de Carvalho -- @biasedbit / http://biasedbit.com//  Copyright (c) 2012 BiasedBit. All rights reserved.//#pragma mark - Enumstypedef enum{    // User must provide pre-transition and transition blocks    BBCyclingLabelTransitionEffectCustom = 0,    BBCyclingLabelTransitionEffectFadeIn    = 1 << 0,    BBCyclingLabelTransitionEffectFadeOut   = 1 << 1,    BBCyclingLabelTransitionEffectCrossFade = BBCyclingLabelTransitionEffectFadeIn |                                              BBCyclingLabelTransitionEffectFadeOut,    BBCyclingLabelTransitionEffectZoomIn  = 1 << 2,    BBCyclingLabelTransitionEffectZoomOut = 1 << 3,    BBCyclingLabelTransitionEffectScaleFadeOut = BBCyclingLabelTransitionEffectFadeIn |                                                 BBCyclingLabelTransitionEffectFadeOut |                                                 BBCyclingLabelTransitionEffectZoomOut,    BBCyclingLabelTransitionEffectScaleFadeIn  = BBCyclingLabelTransitionEffectFadeIn |                                                 BBCyclingLabelTransitionEffectFadeOut |                                                 BBCyclingLabelTransitionEffectZoomIn,    // These two move the entering label from above/below to center and exiting label up/down without cross-fade    // It's a good idea to set the clipsToBounds property of the BBCyclingLabel to true and use this in a confined space    BBCyclingLabelTransitionEffectScrollUp   = 1 << 4,    BBCyclingLabelTransitionEffectScrollDown = 1 << 5,    BBCyclingLabelTransitionEffectDefault = BBCyclingLabelTransitionEffectCrossFade} BBCyclingLabelTransitionEffect;#pragma mark - Custom typestypedef void(^BBCyclingLabelPreTransitionBlock)(UILabel* labelToEnter);typedef void(^BBCyclingLabelTransitionBlock)(UILabel* labelToExit, UILabel* labelToEnter);#pragma mark -@interface BBCyclingLabel : UIView#pragma mark Public properties@property(assign, nonatomic) BBCyclingLabelTransitionEffect   transitionEffect;@property(copy,   nonatomic) BBCyclingLabelPreTransitionBlock preTransitionBlock;@property(copy,   nonatomic) BBCyclingLabelTransitionBlock    transitionBlock;@property(assign, nonatomic) NSTimeInterval                   transitionDuration;// Same properties as UILabel, these will be propagated to the underlying labels@property(copy,   nonatomic) NSString*            text;@property(strong, nonatomic) UIFont*              font;@property(strong, nonatomic) UIColor*             textColor;@property(strong, nonatomic) UIColor*             shadowColor;@property(assign, nonatomic) CGSize               shadowOffset;@property(assign, nonatomic) UITextAlignment      textAlignment;@property(assign, nonatomic) UILineBreakMode      lineBreakMode;@property(assign, nonatomic) NSInteger            numberOfLines;@property(assign, nonatomic) BOOL                 adjustsFontSizeToFitWidth;@property(assign, nonatomic) CGFloat              minimumFontSize;@property(assign, nonatomic) UIBaselineAdjustment baselineAdjustment;#pragma mark Creation- (id)initWithFrame:(CGRect)frame andTransitionType:(BBCyclingLabelTransitionEffect)transitionEffect;#pragma mark Public methods/*! Sets the text for the next label and performs a transition between current and next label (if animated is YES) */- (void)setText:(NSString*)text animated:(BOOL)animated;@end

//// Copyright 2012 BiasedBit//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.//////  Created by Bruno de Carvalho -- @biasedbit / http://biasedbit.com//  Copyright (c) 2012 BiasedBit. All rights reserved.//#import "BBCyclingLabel.h"#pragma mark - ConstantsNSTimeInterval const kBBCyclingLabelDefaultTransitionDuration = 0.3;#pragma mark -@interface BBCyclingLabel (){    NSUInteger _currentLabelIndex;}#pragma mark Private properties@property(strong, nonatomic) NSArray* labels;@property(strong, nonatomic) UILabel* currentLabel;#pragma mark Private helpers- (void)setupWithEffect:(BBCyclingLabelTransitionEffect)effect andDuration:(NSTimeInterval)duration;- (void)prepareTransitionBlocks;- (NSUInteger)nextLabelIndex;- (void)resetLabel:(UILabel*)label;@end#pragma mark -@implementation BBCyclingLabel#pragma mark Property synthesizers@synthesize transitionEffect   = _transitionEffect;@synthesize preTransitionBlock = _preTransitionBlock;@synthesize transitionBlock    = _transitionBlock;@synthesize transitionDuration = _transitionDuration;// Private@synthesize labels       = _labels;@synthesize currentLabel = _currentLabel;#pragma mark Creation- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self != nil) {        [self setupWithEffect:BBCyclingLabelTransitionEffectDefault                  andDuration:kBBCyclingLabelDefaultTransitionDuration];    }    return self;}- (id)initWithCoder:(NSCoder*)coder{    self = [super initWithCoder:coder];    if (self != nil) {        [self setupWithEffect:BBCyclingLabelTransitionEffectDefault                  andDuration:kBBCyclingLabelDefaultTransitionDuration];    }    return self;}- (id)initWithFrame:(CGRect)frame andTransitionType:(BBCyclingLabelTransitionEffect)transitionEffect;{    self = [super initWithFrame:frame];    if (self != nil) {        [self setupWithEffect:transitionEffect                  andDuration:kBBCyclingLabelDefaultTransitionDuration];    }    return self;}#pragma mark Manual property accessors- (void)setTransitionEffect:(BBCyclingLabelTransitionEffect)transitionEffect{    _transitionEffect = transitionEffect;    [self prepareTransitionBlocks];}- (NSString*)text{    return _currentLabel.text;}- (void)setText:(NSString*)text{    [self setText:text animated:YES];}- (UIFont*)font{    return _currentLabel.font;}- (void)setFont:(UIFont*)font{    for (UILabel* label in _labels) {        label.font = font;    }}- (UIColor*)textColor{    return _currentLabel.textColor;}- (void)setTextColor:(UIColor*)textColor{    for (UILabel* label in _labels) {        label.textColor = textColor;    }}- (UIColor*)shadowColor{    return _currentLabel.shadowColor;}- (void)setShadowColor:(UIColor*)shadowColor{    for (UILabel* label in _labels) {        label.shadowColor = shadowColor;    }}- (CGSize)shadowOffset{    return _currentLabel.shadowOffset;}- (void)setShadowOffset:(CGSize)shadowOffset{    for (UILabel* label in _labels) {        label.shadowOffset = shadowOffset;    }}- (UITextAlignment)textAlignment{    return _currentLabel.textAlignment;}- (void)setTextAlignment:(UITextAlignment)textAlignment{    for (UILabel* label in _labels) {        label.textAlignment = textAlignment;    }}- (UILineBreakMode)lineBreakMode{    return _currentLabel.lineBreakMode;}- (void)setLineBreakMode:(UILineBreakMode)lineBreakMode{    for (UILabel* label in _labels) {        label.lineBreakMode = lineBreakMode;    }}- (NSInteger)numberOfLines{    return _currentLabel.numberOfLines;}- (void)setNumberOfLines:(NSInteger)numberOfLines{    for (UILabel* label in _labels) {        label.numberOfLines = numberOfLines;    }}- (BOOL)adjustsFontSizeToFitWidth{    return _currentLabel.adjustsFontSizeToFitWidth;}- (void)setAdjustsFontSizeToFitWidth:(BOOL)adjustsFontSizeToFitWidth{    for (UILabel* label in _labels) {        label.adjustsFontSizeToFitWidth = adjustsFontSizeToFitWidth;    }}- (CGFloat)minimumFontSize{    return _currentLabel.minimumFontSize;}- (void)setMinimumFontSize:(CGFloat)minimumFontSize{    for (UILabel* label in _labels) {        label.minimumFontSize = minimumFontSize;    }}- (UIBaselineAdjustment)baselineAdjustment{    return _currentLabel.baselineAdjustment;}- (void)setBaselineAdjustment:(UIBaselineAdjustment)baselineAdjustment{    for (UILabel* label in _labels) {        label.baselineAdjustment = baselineAdjustment;    }}#pragma mark Public methods- (void)setText:(NSString*)text animated:(BOOL)animated{    NSUInteger nextLabelIndex = [self nextLabelIndex];    UILabel* nextLabel = [_labels objectAtIndex:nextLabelIndex];    UILabel* previousLabel = _currentLabel;    nextLabel.text = text;    // Resetting the label state ensures we can change the transition type without extra code on pre-transition block.    // Without it a transition that has no alpha changes would have to ensure alpha = 1 on pre-transition block (as    // well as with every other possible animatable property)    [self resetLabel:nextLabel];    // Update both current label index and current label pointer    self.currentLabel = nextLabel;    _currentLabelIndex = nextLabelIndex;    // Prepare the next label before the transition animation    if (_preTransitionBlock != nil) {        _preTransitionBlock(nextLabel);    } else {        // If no pre-transition block is set, prepare the next label for a cross-fade        nextLabel.alpha = 0;    }    // Unhide the label that's about to be shown    nextLabel.hidden = NO;    void (^changeBlock)() = ^() {        // Perform the user provided changes        if (_transitionBlock != nil) {            _transitionBlock(previousLabel, nextLabel);        } else {            // If no transition block is set, perform a simple cross-fade            previousLabel.alpha = 0;            nextLabel.alpha = 1;        }    };    void (^completionBlock)(BOOL) = ^(BOOL finished) {        if (finished) {            // TODO this is kind of bugged since all transitions that include affine transforms always return finished            // as true, even when it doesn't finish...            previousLabel.hidden = YES;        }    };    if (animated) {        // Animate the transition between both labels        [UIView animateWithDuration:_transitionDuration animations:changeBlock completion:completionBlock];    } else {        changeBlock();        completionBlock(YES);    }}#pragma mark Private helpers- (void)setupWithEffect:(BBCyclingLabelTransitionEffect)effect andDuration:(NSTimeInterval)duration{    NSUInteger size = 2;    NSMutableArray* labels = [NSMutableArray arrayWithCapacity:size];    for (NSUInteger i = 0; i < size; i++) {        UILabel* label = [[UILabel alloc] initWithFrame:self.bounds];        [self addSubview:label];        label.backgroundColor = [UIColor clearColor];        label.hidden = YES;        label.numberOfLines = 0;        [labels addObject:label];    }    _currentLabelIndex = 0;    self.currentLabel = [labels objectAtIndex:0];    self.labels = labels;    _currentLabel.hidden = NO;    self.transitionEffect = effect;    self.transitionDuration = duration;}- (void)prepareTransitionBlocks{    //if matches custom    if (_transitionEffect == BBCyclingLabelTransitionEffectCustom) {        return;    }    BBCyclingLabelTransitionEffect type = _transitionEffect;    self.preTransitionBlock = ^(UILabel* labelToEnter) {        if (type & BBCyclingLabelTransitionEffectFadeIn) {            labelToEnter.alpha = 0;        }        if (type & BBCyclingLabelTransitionEffectZoomIn) {            labelToEnter.transform = CGAffineTransformMakeScale(0.5, 0.5);        }        if (type & (BBCyclingLabelTransitionEffectScrollUp | BBCyclingLabelTransitionEffectScrollDown)) {            CGRect frame = labelToEnter.frame;            if (type & BBCyclingLabelTransitionEffectScrollUp) {                frame.origin.y = self.bounds.size.height;            }            if (type & BBCyclingLabelTransitionEffectScrollDown) {                frame.origin.y = 0 - frame.size.height;            }            labelToEnter.frame = frame;        }    };    self.transitionBlock = ^(UILabel* labelToExit, UILabel* labelToEnter) {        if (type & BBCyclingLabelTransitionEffectFadeIn) {            labelToEnter.alpha = 1;        }        if (type & BBCyclingLabelTransitionEffectFadeOut) {            labelToExit.alpha = 0;        }        if (type & BBCyclingLabelTransitionEffectZoomOut) {            labelToExit.transform = CGAffineTransformMakeScale(1.5, 1.5);        }        if (type & BBCyclingLabelTransitionEffectZoomIn) {            labelToEnter.transform = CGAffineTransformIdentity;        }        if (type & (BBCyclingLabelTransitionEffectScrollUp | BBCyclingLabelTransitionEffectScrollDown)) {            CGRect frame = labelToExit.frame;            CGRect enterFrame = labelToEnter.frame;            if (type & BBCyclingLabelTransitionEffectScrollUp) {                frame.origin.y = 0 - frame.size.height;                 enterFrame.origin.y = roundf((self.bounds.size.height / 2) - (enterFrame.size.height / 2));            }            if (type & BBCyclingLabelTransitionEffectScrollDown) {                frame.origin.y = self.bounds.size.height;                enterFrame.origin.y = roundf((self.bounds.size.height / 2) - (enterFrame.size.height / 2));            }            labelToExit.frame = frame;            labelToEnter.frame = enterFrame;        }    };}- (NSUInteger)nextLabelIndex{    return (_currentLabelIndex + 1) % [_labels count];}- (void)resetLabel:(UILabel*)label{    label.alpha = 1;    label.transform = CGAffineTransformIdentity;    label.frame = self.bounds;}@end

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