282 lines
10 KiB
Objective-C
282 lines
10 KiB
Objective-C
//
|
||
// KBStreamTextView.m
|
||
// KeyBoard
|
||
//
|
||
// 实现：一个接收“流式文本”的可滚动视图。
|
||
// 以分隔符（默认："\t"）切分文本，每个分段创建一个 UILabel。
|
||
// 标签可自动换行并可点击，整体置于 UIScrollView 中以支持滚动。
|
||
//
|
||
|
||
#import "KBStreamTextView.h"
|
||
#import "KBResponderUtils.h" // 通过响应链找到 UIInputViewController，并将文本输出到宿主
|
||
|
||
@interface KBStreamTextView ()
|
||
|
||
// 承载所有标签的滚动容器
|
||
@property (nonatomic, strong) UIScrollView *scrollView;
|
||
// 已创建的标签集合（顺序即显示顺序）
|
||
@property (nonatomic, strong) NSMutableArray<UILabel *> *labels;
|
||
// 文本缓冲：保存尚未遇到分隔符的尾部文本
|
||
@property (nonatomic, copy) NSString *buffer;
|
||
|
||
@end
|
||
|
||
@implementation KBStreamTextView
|
||
|
||
- (instancetype)initWithFrame:(CGRect)frame {
|
||
if (self = [super initWithFrame:frame]) {
|
||
[self commonInit];
|
||
}
|
||
return self;
|
||
}
|
||
|
||
- (instancetype)initWithCoder:(NSCoder *)coder {
|
||
if (self = [super initWithCoder:coder]) {
|
||
[self commonInit];
|
||
}
|
||
return self;
|
||
}
|
||
|
||
- (void)commonInit {
|
||
_delimiter = @"\t";
|
||
_labelFont = [UIFont systemFontOfSize:16.0];
|
||
if (@available(iOS 13.0, *)) {
|
||
_labelTextColor = [UIColor labelColor];
|
||
} else {
|
||
_labelTextColor = [UIColor blackColor];
|
||
}
|
||
_contentHorizontalPadding = 12.0;
|
||
_interItemSpacing = 5.0; // 标签之间的垂直间距 5pt
|
||
_labels = [NSMutableArray array];
|
||
_buffer = @"";
|
||
_shouldTrimSegments = YES;
|
||
|
||
// 初始化滚动视图并填满自身
|
||
_scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
|
||
_scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
|
||
_scrollView.alwaysBounceVertical = YES;
|
||
_scrollView.showsVerticalScrollIndicator = YES;
|
||
// 留一点底部余量，避免最后一行视觉上“贴底被遮住”的感觉
|
||
_scrollView.contentInset = UIEdgeInsetsMake(0, 0, 6, 0);
|
||
_scrollView.scrollIndicatorInsets = _scrollView.contentInset;
|
||
[self addSubview:_scrollView];
|
||
}
|
||
|
||
#pragma mark - Public API
|
||
|
||
// 边输边见：实时更新当前 label 文本，遇到分隔符就新建下一个 label
|
||
- (void)appendStreamText:(NSString *)text {
|
||
if (text.length == 0) { return; }
|
||
|
||
// 若在子线程被调用，切回主线程更新 UI
|
||
if (![NSThread isMainThread]) {
|
||
__weak typeof(self) weakSelf = self;
|
||
dispatch_async(dispatch_get_main_queue(), ^{
|
||
[weakSelf appendStreamText:text];
|
||
});
|
||
return;
|
||
}
|
||
|
||
// 容错：若分隔符为空，退化为直接将所有内容作为一个段落展示
|
||
if (self.delimiter.length == 0) {
|
||
[self ensureCurrentLabelExists];
|
||
self.buffer = [self.buffer stringByAppendingString:text];
|
||
self.labels.lastObject.text = self.buffer;
|
||
[self layoutLabelsForCurrentWidth];
|
||
[self scrollToBottomIfNeeded];
|
||
return;
|
||
}
|
||
|
||
// 确保有一个“进行中”的 label
|
||
[self ensureCurrentLabelExists];
|
||
|
||
// 将传入文本按分隔符切分。parts.count = 分段数；分隔符数量 = parts.count - 1
|
||
NSArray<NSString *> *parts = [text componentsSeparatedByString:self.delimiter];
|
||
|
||
// 1) 先把第一段拼接到当前缓冲并实时显示
|
||
self.buffer = [self.buffer stringByAppendingString:parts.firstObject ?: @""];
|
||
self.labels.lastObject.text = self.buffer; // 不裁剪，保留实时输入
|
||
[self layoutLabelsForCurrentWidth];
|
||
|
||
// 2) 处理每一个分隔符：完成当前段（可选裁剪）并新建空标签，然后填入下一段的内容
|
||
for (NSUInteger i = 1; i < parts.count; i++) {
|
||
// a) 完成当前段：对外观进行最终裁剪（若开启）
|
||
UILabel *current = self.labels.lastObject;
|
||
if (self.shouldTrimSegments) {
|
||
NSString *trimmed = [current.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
|
||
current.text = trimmed;
|
||
}
|
||
[self layoutLabelsForCurrentWidth];
|
||
|
||
// b) 新建一个空标签，代表下一个段（即刻创建，哪怕下一段当前为空）
|
||
[self createEmptyLabelAsNewSegment];
|
||
|
||
// c) 将该分隔符之后的这段文本作为新段的初始内容（仍旧实时显示，不裁剪）
|
||
NSString *piece = parts[i];
|
||
self.buffer = piece ?: @"";
|
||
self.labels.lastObject.text = self.buffer;
|
||
[self layoutLabelsForCurrentWidth];
|
||
}
|
||
|
||
[self scrollToBottomIfNeeded];
|
||
}
|
||
|
||
- (void)reset {
|
||
for (UILabel *lbl in self.labels) {
|
||
[lbl removeFromSuperview];
|
||
}
|
||
[self.labels removeAllObjects];
|
||
self.buffer = @"";
|
||
self.scrollView.contentSize = CGSizeMake(self.bounds.size.width, 0);
|
||
}
|
||
|
||
#pragma mark - Layout Helpers
|
||
|
||
- (void)addLabelForText:(NSString *)text {
|
||
if (self.shouldTrimSegments) {
|
||
text = [text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
|
||
}
|
||
// 创建一个可换行、可点击的 UILabel
|
||
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
|
||
label.numberOfLines = 0;
|
||
label.font = self.labelFont;
|
||
label.textColor = self.labelTextColor;
|
||
label.userInteractionEnabled = YES; // 允许点击
|
||
label.text = text;
|
||
|
||
// 添加点击手势
|
||
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleLabelTap:)];
|
||
[label addGestureRecognizer:tap];
|
||
|
||
[self.scrollView addSubview:label];
|
||
[self.labels addObject:label];
|
||
|
||
// 依据当前宽度立即布局
|
||
[self layoutLabelsForCurrentWidth];
|
||
|
||
// 滚动到底部以展示最新的标签
|
||
[self scrollToBottomIfNeeded];
|
||
}
|
||
|
||
#pragma mark - Streaming Helpers
|
||
|
||
// 确保存在一个可供“进行中输入”的 label，不存在则新建空标签
|
||
- (void)ensureCurrentLabelExists {
|
||
if (self.labels.lastObject) { return; }
|
||
[self createEmptyLabelAsNewSegment];
|
||
}
|
||
|
||
// 创建一个空白的新段标签，并追加到滚动视图中
|
||
- (void)createEmptyLabelAsNewSegment {
|
||
UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
|
||
label.numberOfLines = 0;
|
||
label.font = self.labelFont;
|
||
label.textColor = self.labelTextColor;
|
||
label.userInteractionEnabled = YES;
|
||
label.text = @"";
|
||
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleLabelTap:)];
|
||
[label addGestureRecognizer:tap];
|
||
|
||
[self.scrollView addSubview:label];
|
||
[self.labels addObject:label];
|
||
self.buffer = @"";
|
||
|
||
[self layoutLabelsForCurrentWidth];
|
||
}
|
||
|
||
- (void)finishStreaming {
|
||
if (![NSThread isMainThread]) {
|
||
__weak typeof(self) weakSelf = self;
|
||
dispatch_async(dispatch_get_main_queue(), ^{
|
||
[weakSelf finishStreaming];
|
||
});
|
||
return;
|
||
}
|
||
UILabel *current = self.labels.lastObject;
|
||
if (!current) { return; }
|
||
if (self.shouldTrimSegments) {
|
||
NSString *trimmed = [current.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
|
||
current.text = trimmed;
|
||
self.buffer = trimmed;
|
||
}
|
||
// 无论是否裁剪，都重新布局并滚动到底部，避免最后一段显示不全
|
||
[self layoutLabelsForCurrentWidth];
|
||
[self scrollToBottomIfNeeded];
|
||
}
|
||
|
||
- (void)layoutSubviews {
|
||
[super layoutSubviews];
|
||
// 处理宽度变化（例如旋转/键盘容器大小变化）时的重排
|
||
[self layoutLabelsForCurrentWidth];
|
||
}
|
||
|
||
- (void)layoutLabelsForCurrentWidth {
|
||
CGFloat width = self.bounds.size.width;
|
||
if (width <= 0) { return; }
|
||
|
||
CGFloat x = self.contentHorizontalPadding;
|
||
CGFloat maxLabelWidth = MAX(0.0, width - 2.0 * self.contentHorizontalPadding);
|
||
CGFloat y = self.interItemSpacing; // 顶部预留同等间距
|
||
|
||
for (NSUInteger idx = 0; idx < self.labels.count; idx++) {
|
||
UILabel *label = self.labels[idx];
|
||
CGSize size = [self sizeForText:label.text font:label.font maxWidth:maxLabelWidth];
|
||
label.frame = CGRectMake(x, y, maxLabelWidth, size.height);
|
||
y += size.height;
|
||
// 标签间距：下一个标签位于上一个标签下方 5pt
|
||
if (idx + 1 < self.labels.count) {
|
||
y += self.interItemSpacing;
|
||
}
|
||
}
|
||
|
||
CGFloat contentHeight = MAX(y + self.interItemSpacing, self.bounds.size.height + 1.0);
|
||
self.scrollView.contentSize = CGSizeMake(width, contentHeight);
|
||
}
|
||
|
||
- (CGSize)sizeForText:(NSString *)text font:(UIFont *)font maxWidth:(CGFloat)maxWidth {
|
||
if (text.length == 0) {
|
||
// 空文本段仍保留一行高度，保证可点击区域
|
||
return CGSizeMake(maxWidth, font.lineHeight);
|
||
}
|
||
CGRect rect = [text boundingRectWithSize:CGSizeMake(maxWidth, CGFLOAT_MAX)
|
||
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
|
||
attributes:@{NSFontAttributeName: font}
|
||
context:nil];
|
||
// 向上取整，避免像素裁切
|
||
return CGSizeMake(maxWidth, ceil(rect.size.height));
|
||
}
|
||
|
||
- (void)scrollToBottomIfNeeded {
|
||
CGFloat height = self.scrollView.bounds.size.height;
|
||
CGFloat contentHeight = self.scrollView.contentSize.height;
|
||
if (contentHeight > height && height > 0) {
|
||
CGPoint bottomOffset = CGPointMake(0, contentHeight - height);
|
||
// 使用无动画滚动，避免在短时间内多次追加时“最后一行没完全跟上”的错觉
|
||
[self.scrollView setContentOffset:bottomOffset animated:NO];
|
||
}
|
||
}
|
||
|
||
#pragma mark - Tap Handling
|
||
|
||
- (void)handleLabelTap:(UITapGestureRecognizer *)tap {
|
||
UILabel *label = (UILabel *)tap.view;
|
||
if (![label isKindOfClass:[UILabel class]]) { return; }
|
||
NSInteger index = [self.labels indexOfObject:label];
|
||
NSString *text = label.text ?: @"";
|
||
if (index != NSNotFound && self.onLabelTap) {
|
||
self.onLabelTap(index, text);
|
||
}
|
||
|
||
// 将文本发送到当前宿主应用的输入框（搜索框/TextView 等）
|
||
// 注：键盘扩展无需“完全访问”也可 insertText:
|
||
UIInputViewController *ivc = KBFindInputViewController(self);
|
||
if (ivc) {
|
||
id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
|
||
if (text.length > 0 && [proxy conformsToProtocol:@protocol(UITextDocumentProxy)]) {
|
||
[proxy insertText:text];
|
||
}
|
||
}
|
||
}
|
||
|
||
@end
|