144 lines
4.5 KiB
Objective-C
144 lines
4.5 KiB
Objective-C
// Copyright (c) 2024 Tencent. All rights reserved.
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// Author: eddardliu
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#import "TUIMultimediaAutoScrollLabel.h"
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#import <Masonry/Masonry.h>
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#import "TUIMultimediaPlugin/TUIMultimediaCommon.h"
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#import "TUIMultimediaPlugin/TUIMultimediaGeometry.h"
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static NSString *const ScrollAnimeKey = @"ScrollAnimeKey";
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@interface TUIMultimediaAutoScrollLabel () <CAAnimationDelegate> {
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UIScrollView *_scrollView;
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UILabel *_label;
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UILabel *_label2;
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CAGradientLayer *_fadeLayer;
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}
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@end
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@implementation TUIMultimediaAutoScrollLabel
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- (id)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self != nil) {
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_scrollSpeed = 20;
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_pauseInterval = 2;
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_text = [[NSAttributedString alloc] initWithString:@""];
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_fadeInOutRate = 0.1;
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[self initUI];
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}
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return self;
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}
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- (void)initUI {
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_scrollView = [[UIScrollView alloc] init];
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_scrollView.scrollEnabled = NO;
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_scrollView.userInteractionEnabled = NO;
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[self addSubview:_scrollView];
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_label = [[UILabel alloc] init];
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_label.numberOfLines = 1;
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[_scrollView addSubview:_label];
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_label2 = [[UILabel alloc] init];
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_label2.numberOfLines = 1;
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[_scrollView addSubview:_label2];
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NSArray *fadeColorList = @[
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(__bridge id)[UIColor.blackColor colorWithAlphaComponent:0].CGColor,
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(__bridge id)UIColor.blackColor.CGColor,
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(__bridge id)UIColor.blackColor.CGColor,
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(__bridge id)[UIColor.blackColor colorWithAlphaComponent:0].CGColor,
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];
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_fadeLayer = [[CAGradientLayer alloc] init];
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_fadeLayer.backgroundColor = UIColor.clearColor.CGColor;
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_fadeLayer.colors = fadeColorList;
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_fadeLayer.locations = @[ @0, @(_fadeInOutRate), @(1 - _fadeInOutRate), @1 ];
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_fadeLayer.startPoint = CGPointMake(0, 0.5);
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_fadeLayer.endPoint = CGPointMake(1, 0.5);
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[_scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
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make.height.equalTo(_label.mas_height);
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make.edges.equalTo(self);
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}];
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[_label mas_makeConstraints:^(MASConstraintMaker *make) {
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make.left.top.bottom.equalTo(_scrollView);
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}];
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[_label2 mas_makeConstraints:^(MASConstraintMaker *make) {
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make.top.bottom.equalTo(_scrollView);
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make.left.equalTo(_label.mas_right).offset(self.bounds.size.width);
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}];
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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_fadeLayer.frame = self.bounds;
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if (_active) {
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[self startScroll];
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}
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[_label2 mas_updateConstraints:^(MASConstraintMaker *make) {
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make.left.equalTo(_label.mas_right).offset(self.bounds.size.width);
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}];
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}
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- (void)startScroll {
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CGFloat scrollWidth = _scrollView.bounds.size.width;
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CGFloat labelWidth = _label.bounds.size.width;
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[_scrollView.layer removeAnimationForKey:ScrollAnimeKey];
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_scrollView.bounds = CGRectMake(0, 0, _scrollView.bounds.size.width, _scrollView.bounds.size.height);
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CABasicAnimation *anime = [CABasicAnimation animationWithKeyPath:@"bounds.origin.x"];
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anime.fromValue = @(0);
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anime.toValue = @(labelWidth + scrollWidth);
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anime.duration = (labelWidth + scrollWidth) / _scrollSpeed;
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anime.removedOnCompletion = NO;
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anime.delegate = self;
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[_scrollView.layer addAnimation:anime forKey:ScrollAnimeKey];
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}
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- (void)stopScroll {
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[_scrollView.layer removeAnimationForKey:ScrollAnimeKey];
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_scrollView.contentOffset = CGPointMake(0, 0);
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}
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- (void)animationDidStop:(CAAnimation *)anime finished:(BOOL)finished {
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if (anime == [_scrollView.layer animationForKey:ScrollAnimeKey] && finished && _active) {
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(_pauseInterval * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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if (self->_active) {
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[self startScroll];
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}
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});
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}
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}
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#pragma mark - Properties
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- (void)setActive:(BOOL)active {
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if (!_active && active) {
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[self startScroll];
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self.layer.mask = _fadeLayer;
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} else if (_active && !active) {
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[self stopScroll];
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self.layer.mask = nil;
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}
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_active = active;
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}
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- (void)setText:(NSAttributedString *)text {
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_label.attributedText = text;
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[_label sizeToFit];
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_label2.attributedText = text;
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[_label2 sizeToFit];
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_scrollView.contentSize = _label.bounds.size;
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_scrollView.contentOffset = CGPointMake(0, 0);
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if (_active) {
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[self startScroll];
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}
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}
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- (void)setFadeInOutRate:(CGFloat)fadeInOutRate {
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_fadeInOutRate = MAX(0, MIN(1, fadeInOutRate));
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_fadeLayer.locations = @[ @0, @(_fadeInOutRate), @(1 - _fadeInOutRate), @1 ];
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}
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@end
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