新浪微博客户端(50)-解决输入Emotion表情逐渐变小的问题

UITextView+Extension.h

#import <UIKit/UIKit.h>

@interface UITextView (Extension)

/** 插入属性文本 */
- (NSMutableAttributedString *)insertAttributeText:(NSAttributedString *)insertAttrText;

/** 插入属性文本和要设置的block内容 */
- (NSMutableAttributedString *)insertAttributeText:(NSAttributedString *)insertAttrText settingsBlock:(void (^)(NSMutableAttributedString * attributedString)) settingsBlock;

@end

UITextView+Extension.m

#import "UITextView+Extension.h"

@implementation UITextView (Extension)

- (NSMutableAttributedString *)insertAttributeText:(NSAttributedString *)insertAttrText {

    return [self insertAttributeText:insertAttrText settingsBlock:nil];

}

- (NSMutableAttributedString *)insertAttributeText:(NSAttributedString *)insertAttrText settingsBlock:(void (^)(NSMutableAttributedString *))settingsBlock {

    // 以textView的原本内容为基础构造一个attrStr
    NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];

    // 将附件文本插入到光标所在的位置
    NSUInteger cursorLocation = self.selectedRange.location;
    [attrStr insertAttributedString:insertAttrText atIndex:cursorLocation];

    // 如果传入了block,就调用block
    if(settingsBlock) {
        settingsBlock(attrStr);
    }

    // 更新当前textView内容
    self.attributedText = attrStr;

    // 修正当前光标位置(将光标移动到插入表情末尾,默认光标会跳转到所有文本最后)
    self.selectedRange = NSMakeRange(cursorLocation + 1, 0);

    return attrStr;

}

@end

DJEmotionTextView.m

#import "DJEmotionTextView.h"
#import "DJEmotion.h"

@implementation DJEmotionTextView

- (void)insertEmotion:(DJEmotion *)emotion {

    // 插入表情
    if (emotion.code) { // Emoji表情
        [self insertText:[NSString emojiWithStringCode:emotion.code]];
    } else if (emotion.png) { // 表情图片
        NSString *emotionName = emotion.png;
        NSString *imagePath;
        if ([emotionName hasPrefix:@"d_"] || [emotionName hasPrefix:@"f_"] ||
            [emotionName hasPrefix:@"h_"] || [emotionName hasPrefix:@"l_"] || [emotionName hasPrefix:@"o_"] || [emotionName hasPrefix:@"w_"]) {
            imagePath = [NSString stringWithFormat:@"EmotionIcons/default/%@",emotion.png]; // 默认表情路径
        } else if ([emotionName hasPrefix:@"lxh_"]) {
            imagePath = [NSString stringWithFormat:@"EmotionIcons/lxh/%@",emotion.png]; // 浪小花表情路径
        }

        // 构造表情附件
        NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
        attachment.image = [UIImage imageNamed:imagePath];
        CGFloat attachmentWH = self.font.lineHeight;
        attachment.bounds = CGRectMake(0, -4, attachmentWH, attachmentWH);
        NSAttributedString *attachStr = [NSAttributedString attributedStringWithAttachment:attachment];

        // 插入属性文本
        [self insertAttributeText:attachStr settingsBlock:^(NSMutableAttributedString *attributedString) {

            // 设置当前attrStr的字体与textView原有字体大小一致,因为attrStr的字体无法通过textview.font属性来设置
            [attributedString addAttribute:NSFontAttributeName value:self.font range:NSMakeRange(0, attributedString.length)];

        }];
    }

}

@end