【移动应用开发技术】怎么在iOS中实现一个文字水平无间断滚动效果

【移动应用开发技术】怎么在iOS中实现一个文字水平无间断滚动效果

本篇文章为大家展示了怎么在iOS中实现一个文字水平无间断滚动效果，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。ViewController.h#import

<UIKit/UIKit.h>

@interface

ViewController

:

UIViewController{

NSTimer

*timer;

UIScrollView

*scrollViewText;

}

@property

(nonatomic

,strong)

NSArray

*arrData;

@endViewController.m//

//

ViewController.m

//

滚动

//

#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

20.0f

//每次移动的距离

#define

K_MAIN_VIEW_SCROLLER_LABLE_WIDTH

18.0f

//单个字符宽度(与你设置的字体大小一致)

#define

K_MAIN_VIEW_SCROLLER_LABLE_MARGIN

20.0f

//前后间隔距离

#define

K_MAIN_VIEW_SCROLLER_SLEEP_INTERVAL

1

//停留时间

@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"

:@"/upload/information/20200623/126/118344.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"

:@"/upload/information/20200623/126/118345.jpg",

@"newsTitle"

:@"欧盟峰会或现希腊转机，黄金打响1162保卫战"

},

@{

@"newsId"

:@"201507070656471857",

@"newsImg"

:@"/upload/information/20200623/126/118347.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,

80,

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.scrollEnabled

=

NO;

//禁用手动滑动

//横竖屏自适应

scrollViewText.autoresizingMask

=

UIViewAutoresizingFlexibleWidth;

scrollViewText.tag

=

K_MAIN_VIEW_SCROLL_TEXT_TAG;

[scrollViewText

setBackgroundColor:[UIColor

grayColor]];

//给滚动视图添加事件

UITapGestureRecognizer

*tapGesture

=

[[UITapGestureRecognizer

alloc]

initWithTarget:self

action:@selector(scrollerViewClick:)];

[scrollViewText

addGestureRecognizer:tapGesture];

//添加到当前视图

[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;

//设置滚动文字

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];

//横竖屏自适应

btnText.autoresizingMask

=

UIViewAutoresizingFlexibleWidth;

offsetX

+=

btnText.frame.origin.x;

//设置为

NO,否则无法响应点击事件

btnText.userInteractionEnabled

=

NO;

//添加到滚动视图

[scrollViewText

addSubview:btnText];

i++;

}

//设置滚动区域大小

[scrollViewText

setContentSize:CGSizeMake(offsetX,

0)];

}

}

#pragma

mark

-

滚动处理

//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{

[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

-

动态获取左边位置

-(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

-

新闻点击事件

-(void)btnNewsClick:(UIButton

*)

sender{

NSString

*strNewsTitle

=

sende