iOS中怎么實現文字水平無間斷滾動效果

iOS中怎么實現文字水平無間斷滾動效果，很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細講解，有這方面需求的人可以來學習下，希望你能有所收獲。

ViewController.h

#import <UIKit/UIKit.h>@interface ViewController : UIViewController{  NSTimer      *timer;  UIScrollView   *scrollViewText;}@property (nonatomic ,strong) NSArray *arrData;@end

ViewController.m

//// ViewController.m// 滾動//#import "ViewController.h"#pragma mark - Class define variable#define K_MAIN_VIEW_SCROLL_HEIGHT 80.0f#define K_MAIN_VIEW_SCROLL_TEXT_TAG 300#define K_MAIN_VIEW_TEME_INTERVAL 0.35        //計時器間隔時間(單位秒)#define K_MAIN_VIEW_SCROLLER_SPACE 20.0f       //每次移動的距離#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH   18.0f  //單個字符寬度(與你設置的字體大小一致)#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN  20.0f  //前后間隔距離#define K_MAIN_VIEW_SCROLLER_SLEEP_INTERVAL 1    //停留時間@interface ViewController ()@end@implementation ViewController#pragma mark - Class property@synthesize arrData;- (void)viewDidLoad {  [super viewDidLoad];  [self initView];}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}#pragma mark - Custom method//初始化數據-(void) initView{  if (!self.arrData) {    self.arrData = @[             @{               @"newsId"  :@"201507070942261935",               @"newsImg" :@"https://cache.yisu.com/upload/information/20201211/272/44764.jpg",               @"newsTitle":@"三大理由歐元任性抗跌，歐元區峰會將為希臘定調"             },             @{               @"newsId"  :@"201507070929021220",               @"newsImg"  :@"https://cache.yisu.com/upload/information/20201211/272/44765.jpg",               @"newsTitle" :@"歐盟峰會或現希臘轉機，黃金打響1162保衛戰"             },             @{               @"newsId"  :@"201507070656471857",               @"newsImg"  :@"https://cache.yisu.com/upload/information/20201211/272/44766.jpg",               @"newsTitle" :@"希臘困局歐元不怕，油價服軟暴跌8%"             }           ];  }  //文字滾動  [self initScrollText];  //開啟滾動  [self startScroll];}//文字滾動初始化-(void) initScrollText{  //獲取滾動條  scrollViewText = (UIScrollView *)[self.view viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG];  if(!scrollViewText){    scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 80, self.view.frame.size.width, K_MAIN_VIEW_SCROLL_HEIGHT)];    scrollViewText.showsHorizontalScrollIndicator = NO;  //隱藏水平滾動條    scrollViewText.showsVerticalScrollIndicator = NO;   //隱藏垂直滾動條    scrollViewText.scrollEnabled = NO;          //禁用手動滑動    //橫豎屏自適應    scrollViewText.autoresizingMask = UIViewAutoresizingFlexibleWidth;    scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG;    [scrollViewText setBackgroundColor:[UIColor grayColor]];    //給滾動視圖添加事件    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollerViewClick:)];    [scrollViewText addGestureRecognizer:tapGesture];    //添加到當前視圖    [self.view addSubview:scrollViewText];  }else{    //清除子控件    for (UIView *view in [scrollViewText subviews]) {      [view removeFromSuperview];    }  }  if (self.arrData) {    CGFloat offsetX = 0 ,i = 0, h = 30;    //設置滾動文字    UIButton *btnText = nil;    NSString *strTitle = [[NSString alloc] init];    for (NSDictionary *dicTemp in self.arrData) {      strTitle = dicTemp[@"newsTitle"];      btnText = [UIButton buttonWithType:UIButtonTypeCustom];      [btnText setFrame:CGRectMake([self getTitleLeft:i],                     (K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2,                     strTitle.length * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH,                     h)];      [btnText setTitleColor:[UIColor redColor] forState:UIControlStateNormal];      [btnText setTitle:strTitle forState:UIControlStateNormal];      //橫豎屏自適應      btnText.autoresizingMask = UIViewAutoresizingFlexibleWidth;      offsetX += btnText.frame.origin.x;      //設置為 NO,否則無法響應點擊事件      btnText.userInteractionEnabled = NO;      //添加到滾動視圖      [scrollViewText addSubview:btnText];      i++;    }    //設置滾動區域大小    [scrollViewText setContentSize:CGSizeMake(offsetX, 0)];  }}#pragma mark - 滾動處理//開始滾動-(void) startScroll{  if (!timer)    timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES];  [timer fire];}//滾動處理-(void) setScrollText{  [UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{    CGRect rect;    CGFloat offsetX = 0.0,width = 0.0;    for (UIButton *btnText in scrollViewText.subviews) {      rect = btnText.frame;      offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE;      width = [btnText.titleLabel.text length] * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH;      btnText.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height);      NSLog(@"offsetX:%f",offsetX);    }    if (offsetX < -width){      [UIView setAnimationsEnabled:NO];      [self initScrollText];    }else      [UIView setAnimationsEnabled:YES];  }];}#pragma mark - 動態獲取左邊位置-(float) getTitleLeft:(CGFloat) i {  float left = i * K_MAIN_VIEW_SCROLLER_LABLE_MARGIN;  if (i > 0) {    for (int j = 0; j < i; j ++) {      left += [[self.arrData objectAtIndex:j][@"newsTitle"] length] * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH;    }  }  return left;}#pragma mark - 新聞點擊事件-(void)btnNewsClick:(UIButton *) sender{  NSString *strNewsTitle = sender.titleLabel.text;  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"系統提示"                          message:strNewsTitle                          delegate:sender                     cancelButtonTitle:@"確定"                     otherButtonTitles:@"其他", nil];  [alert show];}-(void)scrollerViewClick:(UITapGestureRecognizer*)gesture{  CGPoint touchPoint = [gesture locationInView:scrollViewText];  for (UIButton *btn in scrollViewText.subviews) {    if ([btn.layer.presentationLayer hitTest:touchPoint]) {      [self btnNewsClick:btn];      break;    }  }}@end

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