歌词处理

来源:互联网 时间:2017-01-22




歌词.gif

服务器返回给你的是带时间的歌词,这里我们需要将每一句转换成歌词模型, 没一句歌词放在tableView中, 每一句的歌词填充需要自己画label,根据这首歌的播放位置除以这句歌的总时间


demo源地址
https://github.com/liangxingyan/QQMusic.git


将每一句歌词转成模型
+ (NSArray *)lyricToolWithLrcname:(NSString *)lrc {

// 拿到歌词的数组
NSArray *lrcArray = [lrc componentsSeparatedByString:@"/n"];
NSMutableArray *tempArray = [NSMutableArray array];
// 遍历歌词转换模型
for (NSString *lrcStr in lrcArray) {
// 过滤
if (![lrcStr hasPrefix:@"["]) {
continue;
}
LXYLrc *lxylrc = [[LXYLrc alloc] initWithLrcString:lrcStr];
[tempArray addObject:lxylrc];
}
return tempArray;
}

歌词视图
#import "LrcView.h"
#import "Masonry.h"
#import "LyricTool.h"
#import "LXYLrc.h"
#import "Masonry.h"
#import "LrcTableViewCell.h"
#import "LXYLrcLabel.h"
@interface LrcView () <UITableViewDataSource>
/** 表视图 */
@property (nonatomic, weak) UITableView *tableView;
/** 歌词 */
@property (nonatomic, strong) NSArray *lyrices;
/** 当前播放的下标值 */
@property (nonatomic, assign) NSInteger currentIndex;
@end
@implementation LrcView
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self setupTableView];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
[self setupTableView];
}
return self;
}
- (void)setupTableView {
// 创建tableview
UITableView *tableView = [[UITableView alloc] init];
[self addSubview:tableView];
tableView.backgroundColor = [UIColor clearColor];
tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
tableView.rowHeight = 40;
tableView.translatesAutoresizingMaskIntoConstraints = NO;
tableView.dataSource = self;
self.tableView = tableView;
}
- (void)layoutSubviews {
[super layoutSubviews];
[self.tableView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.mas_top);
make.bottom.equalTo(self.mas_bottom);
make.height.equalTo(self.mas_height);
make.left.equalTo(self.mas_left).offset(self.bounds.size.width);
make.right.equalTo(self.mas_right);
make.width.equalTo(self.mas_width);
}];
// 设置tableview的多出的区域
self.tableView.contentInset = UIEdgeInsetsMake(self.bounds.size.height * 0.5, 0, self.bounds.size.height * 0.5, 0);
}
#pragma mark - UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.lyrices.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

LrcTableViewCell *cell = [LrcTableViewCell lrcCellWithTableView:tableView];
if (self.currentIndex == indexPath.row) {
cell.lrcLabel.font = [UIFont systemFontOfSize:15];
} else {
cell.lrcLabel.font = [UIFont systemFontOfSize:12];
cell.lrcLabel.progress = 0;
}
LXYLrc *lrc = self.lyrices[indexPath.row];
cell.lrcLabel.text = lrc.content;
return cell;
}
#pragma mark - 重写set方法
- (void)setLyric:(NSString *)lyric {
// 下一首歌不会出现上一首歌的残留下标
self.currentIndex = 0;
// 下一首歌不会出现上一首歌的残留歌词
self.lrcLabel.text = @"";
_lyric = lyric;
// 解析歌词
self.lyrices = [LyricTool lyricToolWithLrcname:lyric];
// 刷新表格
[self.tableView reloadData];
}
- (void)setCurrentTime:(NSTimeInterval)currentTime {
_currentTime = currentTime;
NSInteger count = self.lyrices.count;
for (int i = 0; i < count; i++) {
LXYLrc *currentLrc = self.lyrices[i];
NSInteger next = i + 1;
LXYLrc *nextLrc = nil;
if (next < count) {
nextLrc = self.lyrices[next];
}
if (self.currentIndex != i && currentTime >= currentLrc.time && currentTime < nextLrc.time) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
// 上一个
NSIndexPath *previousIndexPath = [NSIndexPath indexPathForRow:self.currentIndex inSection:0];
self.currentIndex = i;
// 刷新
[self.tableView reloadRowsAtIndexPaths:@[indexPath, previousIndexPath] withRowAnimation:UITableViewRowAnimationNone];
// 滚动
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
// 设置外面歌词的label
self.lrcLabel.text = currentLrc.content;
}
// 根据速度,显示label画多少
if (self.currentIndex == i) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
LrcTableViewCell *cell = (LrcTableViewCell *)[self.tableView cellForRowAtIndexPath:indexPath];
// 更新label的进度
CGFloat progress = (currentTime - currentLrc.time) / (nextLrc.time - currentLrc.time);
cell.lrcLabel.progress = progress;
// 设置外面的歌词进度
self.lrcLabel.progress = progress;
}
}
}
@end

绘制label
- (void)setProgress:(CGFloat)progress {
_progress = progress;
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
// 获取需要画的区域
CGRect fillRect = CGRectMake(0, 0, self.bounds.size.width * self.progress, self.bounds.size.height);
[[UIColor colorWithRed:45/255.0 green:183/255.0 blue:101/255.0 alpha:1] set];
// 添加区域
UIRectFillUsingBlendMode(fillRect, kCGBlendModeSourceIn);
}



相关阅读:
Top