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IOS跑马灯效果,实现文字水平无间断滚动

2016-02-15 17:38 866 查看

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController{
NSTimer           *timer;
UIScrollView      *scrollViewText;
}

@property (nonatomic ,strong) NSArray *arrData;

@end


ViewController.m

//
//  ViewController.m
//  跑马灯文字广告
//
//  Created by Time.X on 16/2/15.
//  Copyright © 2016年 Time.X. All rights reserved.
//

#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         //计时器间隔时间(单位秒)
#define K_MAIN_VIEW_SCROLLER_SPACE 20          //每次移动的距离
#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH  280  //字体宽度
#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20   //前后间隔距离

@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
//初始化数据
-(void) initView{

if (!self.arrData) {
self.arrData = @[
@{
@"newsId"   :@"201507070942261935",
@"newsImg"  :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709395519.jpg",
@"newsTitle" : @"三大理由欧元任性抗跌,欧元区峰会将为希腊定调"
},
@{
@"newsId"   :@201507070929021220,
@"newsImg"   :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709273545.jpg",
@"newsTitle" :@"欧盟峰会或现希腊转机,黄金打响1162保卫战"
},
@{
@"newsId"    :@201507070656471857,
@"newsImg"   :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/2015070706533134.jpg",
@"newsTitle" :@"希腊困局欧元不怕,油价服软暴跌8%"
}
];
}

//文字滚动
[self initScrollText];

//开启滚动
[self startScroll];
}

//文字滚动初始化
-(void) initScrollText{

//获取滚动条
scrollViewText = (UIScrollView *)[self.view viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG];
if(!scrollViewText){
scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, K_MAIN_VIEW_SCROLL_HEIGHT)];
scrollViewText.showsHorizontalScrollIndicator = NO;   //隐藏水平滚动条
scrollViewText.showsVerticalScrollIndicator = NO;     //隐藏垂直滚动条
scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG;
[scrollViewText setBackgroundColor:[UIColor grayColor]];

//清除子控件
for (UIView *view in [scrollViewText subviews]) {
[view removeFromSuperview];
}

//添加到当前视图
[self.view addSubview:scrollViewText];
}

if (self.arrData) {

CGFloat offsetX = 0 ,i = 0, h = 30;

//设置滚动文字
UILabel *labText = nil;
for (NSDictionary *dicTemp in self.arrData) {
labText = [[UILabel alloc] initWithFrame:CGRectMake(
i * (K_MAIN_VIEW_SCROLLER_LABLE_WIDTH + K_MAIN_VIEW_SCROLLER_LABLE_MARGIN),
(K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2,
K_MAIN_VIEW_SCROLLER_LABLE_WIDTH,
h)];
[labText setFont:[UIFont systemFontOfSize:18]];
[labText setTextColor:[UIColor whiteColor]];
labText.text = dicTemp[@"newsTitle"];
offsetX += labText.frame.origin.x;

//添加到滚动视图
[scrollViewText addSubview:labText];

i++;
}

//设置滚动区域大小
[scrollViewText setContentSize:CGSizeMake(offsetX, 0)];
}
}

//开始滚动
-(void) startScroll{

if (!timer)
timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES];

[timer fire];
}

//滚动处理
-(void) setScrollText{

CGFloat startX = scrollViewText.contentSize.width - K_MAIN_VIEW_SCROLLER_LABLE_WIDTH - K_MAIN_VIEW_SCROLLER_LABLE_MARGIN;

[UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{
CGRect rect;
CGFloat offsetX = 0.0;

for (UILabel *lab in scrollViewText.subviews) {

rect = lab.frame;
offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE;
if (offsetX < -K_MAIN_VIEW_SCROLLER_LABLE_WIDTH)
offsetX = startX;

lab.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height);
}

NSLog(@"offsetX:%f",offsetX);

}];

}

@end
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