前言
记录一下怎么用 YYLabel 显示表情并计算 Auto Layout 下的高度。
代码
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| - (void)awakeFromNib {
[super awakeFromNib];
self.contentTextLabel.preferredMaxLayoutWidth = [[UIScreen mainScreen] bounds].size.width - 28 - 70 - 20*2;
// Initialization code
}
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| - (void)setMessage:(RTMMessage *)message {
[super setMessage:message];
RTMMessageTextObject * object = (RTMMessageTextObject *)message.contentObject;
NSMutableAttributedString * text = [[NSMutableAttributedString alloc] initWithString:object.content];
text.yy_font = [UIFont systemFontOfSize:17];
YYTextSimpleEmoticonParser * parser = [YYTextSimpleEmoticonParser new];
parser.emoticonMapper = [RTMEmotionManager sharedInstance].emotionDict;
self.contentTextLabel.attributedText = text;;
[parser parseText:text selectedRange:nil];
YYTextContainer * container = [YYTextContainer new];
container.size = CGSizeMake(self.contentTextLabel.preferredMaxLayoutWidth, CGFLOAT_MAX);
YYTextLayout * layout = [YYTextLayout layoutWithContainer:container text:text];
self.contentTextLabel.textLayout = layout;
}
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| + (CGFloat)heightForMessage:(RTMMessage *)message {
static RTMSendTextCell * cell = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
cell = [[NSBundle mainBundle] loadNibNamed:@"RTMSendTextCell" owner:nil options:nil][0];
});
RTMMessageTextObject * object = (RTMMessageTextObject *)message.contentObject;
NSMutableAttributedString * text = [[NSMutableAttributedString alloc] initWithString:object.content];
text.yy_font = [UIFont systemFontOfSize:17];
YYTextSimpleEmoticonParser * parser = [YYTextSimpleEmoticonParser new];
parser.emoticonMapper = [RTMEmotionManager sharedInstance].emotionDict;
cell.contentTextLabel.attributedText = text;;
[parser parseText:text selectedRange:nil];
YYTextContainer * container = [YYTextContainer new];
container.size = CGSizeMake(cell.contentTextLabel.preferredMaxLayoutWidth, CGFLOAT_MAX);
YYTextLayout * layout = [YYTextLayout layoutWithContainer:container text:text];
message.cellHeight = layout.textBoundingSize.height;
return message.cellHeight;
}
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