主要代码：
KJMarqueeLabel.h
#import
typedef NS_ENUM(NSUInteger, KJMarqueeLabelType) {
KJMarqueeLabelTypeLeft = 0,//向左边滚动
KJMarqueeLabelTypeLeftRight = 1,//先向左边，再向右边滚动
};
@interface KJMarqueeLabel : UILabel
@property(nonatomic,unsafe_unretained)KJMarqueeLabelType marqueeLabelType;
@property(nonatomic,unsafe_unretained)CGFloat speed;//速度
@property(nonatomic,unsafe_unretained)CGFloat secondLabelInterval;
@property(nonatomic,unsafe_unretained)NSTimeInterval stopTime;//滚到顶的停止时间
@end
KJMarqueeLabel.m
#import "KJMarqueeLabel.h"
@interface KJMarqueeLabel (){
NSTimer *_timer;
UIScrollView *_scrollV;
UILabel *_label1;
CGSize _scrollViewCcontentSize;
CGFloat x;
UILabel *_label2;
BOOL _isRight;
}
@end
@implementation KJMarqueeLabel
- (void)awakeFromNib {
[super awakeFromNib];
[self commonInit];
}
-(instancetype)init {
if (self = [super init]) {
[self commonInit];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self commonInit];
}
return self;
}
-(instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self commonInit];
}
return self;
}
-(void)commonInit{
self.marqueeLabelType = KJMarqueeLabelTypeLeft;
self.secondLabelInterval = 100;
self.speed = 0.7f;
self.stopTime = 1.5f;
}
-(UILabel *)comnInitLabel:(UILabel *)label {
label = [[UILabel alloc]initWithFrame:self.bounds];
label.text = self.text;
label.font = self.font;
label.textColor = self.textColor;
label.lineBreakMode = NSLineBreakByWordWrapping;
return label;
}
-(void)drawTextInRect:(CGRect)rect {
CGFloat height = self.bounds.size.height;
CGFloat width = self.bounds.size.width;
x = 0;
_label1 = [self comnInitLabel:_label1];
if (self.marqueeLabelType == KJMarqueeLabelTypeLeft) {
_label2 = [self comnInitLabel:_label2];
}
CGSize size = [_label1 sizeThatFits:CGSizeMake(MAXFLOAT,height)];
//如果字符串的宽度小于或等于自身的宽度
if (size.width <= width) {
[super drawTextInRect:rect];
return;
}
_scrollV = [[UIScrollView alloc]initWithFrame:self.bounds];
if (self.marqueeLabelType == KJMarqueeLabelTypeLeft) {
_scrollViewCcontentSize = CGSizeMake(size.width+width+self.secondLabelInterval, size.height);
}else {
_scrollViewCcontentSize = CGSizeMake(size.width, size.height);
}
_scrollV.contentSize = _scrollViewCcontentSize;
[self addSubview:_scrollV];
CGRect rect1 = _label1.frame;
rect1.size.width = size.width;
_label1.frame = rect1;
[_scrollV addSubview:_label1];
if (self.marqueeLabelType == KJMarqueeLabelTypeLeft) {
CGRect rect2 = _label2.frame;
rect2.size.width = width;
rect2.origin.x = size.width + self.secondLabelInterval;
_label2.frame = rect2;
[_scrollV addSubview:_label2];
}
[self Timer];
}
-(void)Timer {
if (_timer) {
[_timer invalidate];
_timer = nil;
}
_timer = [NSTimer scheduledTimerWithTimeInterval:0.01f target:self selector:@selector(refreshMarqueeLabelFrame) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}
-(void)FistTimer {
if (_timer) {
[_timer invalidate];
_timer = nil;
}
_timer = [NSTimer scheduledTimerWithTimeInterval:self.stopTime target:self selector:@selector(delayMethod) userInfo:nil repeats:NO];
}
-(void)dealloc {
if (_timer) {
[_timer invalidate];
_timer = nil;
}
}
-(void)delayMethod {
[self Timer];
}
- (void)refreshMarqueeLabelFrame {
if (self.marqueeLabelType == KJMarqueeLabelTypeLeft) {
x += self.speed;
if (x > _scrollViewCcontentSize.width - _scrollV.bounds.size.width) {
[self FistTimer];
x = 0;
}
[_scrollV setContentOffset:CGPointMake(x, 0)];
}else {
if (_isRight) {
x -= self.speed;
}else {
x += self.speed;
}
if (x > _scrollViewCcontentSize.width - _scrollV.bounds.size.width) {
[self FistTimer];
_isRight = YES;
return;
}
if (x <= 0) {
[self FistTimer];
_isRight = NO;
}
[_scrollV setContentOffset:CGPointMake(x, 0)];
}
}
@end
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