新浪微博客户端(45)-显示表情

DJEmotionListView.m

- (void)setEmotions:(NSArray *)emotions {

    
    _emotions = emotions;
    // emotion 总个数
    NSUInteger emotionCount = emotions.count;
    // 页码总个数
    NSUInteger pageNums = (emotionCount + DJEmotionPageSize - 1) / DJEmotionPageSize;
    
    // 更新pageControl 显示个数
    self.emotionPageControl.numberOfPages = pageNums;
    
    // 为scrollView 添加子View
    for (int i = 0; i < pageNums; i++) {
        DJEmotionPageView *pageView = [[DJEmotionPageView alloc] init];
//        pageView.backgroundColor = DJRandomColor;
        
        NSRange range;
        range.location = i * DJEmotionPageSize;
        NSUInteger leftNums = emotionCount - range.location; // 求出当前剩余Emoji个数
        if (leftNums >= DJEmotionPageSize) { // 判断当前剩余Emoji个数是否满20
            range.length = DJEmotionPageSize;
        } else { // 如果不满20,则range.length就等于剩余的个数
            range.length = leftNums;
        }
        
        NSArray *singlePageEmotions = [emotions subarrayWithRange:range];
        pageView.emotions = singlePageEmotions;
        
        [self.emotionScrollView addSubview:pageView];
    }
    
}

DJEmotionPageView.m

#import "DJEmotionPageView.h"
#import "DJEmotion.h"
#import "NSString+Emoji.h"

// PageView 的默认内边距
#define DJEmotionPageViewPadding 10
// PaegView 最大列数
#define DJEmotionPageViewMaxCols 7
// PageView 最大行数
#define DJEmotionPageViewMaxRows 3


@implementation DJEmotionPageView


- (void)setEmotions:(NSArray *)emotions {


    _emotions = emotions;
    
    NSUInteger emotionsCount = emotions.count;
    
    for (int i = 0; i < emotionsCount; i++) {
        
       UIButton *emotionView = [[UIButton alloc] init];
//        emotionView.backgroundColor = DJRandomColor;
        
        // 设置emotion内容
        DJEmotion *emotion = emotions[i];
        NSString *emotionName = emotion.png; // 表情文件名
        if (emotionName) { // 默认表情或浪小花
            if ([emotionName hasPrefix:@"d_"] || [emotionName hasPrefix:@"f_"] ||
                [emotionName hasPrefix:@"h_"] || [emotionName hasPrefix:@"l_"] || [emotionName hasPrefix:@"o_"] || [emotionName hasPrefix:@"w_"]) { // 默认表情
                [emotionView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"EmotionIcons/default/%@",emotion.png]] forState:UIControlStateNormal];
            } else if ([emotionName hasPrefix:@"lxh_"]) { // 浪小花
                [emotionView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"EmotionIcons/lxh/%@",emotion.png]] forState:UIControlStateNormal];

            }
        } else if (emotion.code) { // Emoji
            NSString *emojiName = [NSString emojiWithStringCode:emotion.code];
            [emotionView setTitle:emojiName forState:UIControlStateNormal];
            emotionView.titleLabel.font = [UIFont systemFontOfSize:32];
        }
        
        [self addSubview:emotionView];
        
    }

}



- (void)layoutSubviews {

    [super layoutSubviews];
    
    CGFloat emotionW = (self.width - 2 * DJEmotionPageViewPadding) / DJEmotionPageViewMaxCols;
    CGFloat emotionH = (self.height - DJEmotionPageViewPadding) / DJEmotionPageViewMaxRows;
    
    NSUInteger emotionsCount = self.emotions.count;
    for (int i = 0; i < emotionsCount; i++) {
        UIView *emotionView = self.subviews[i];
        emotionView.x = (i % DJEmotionPageViewMaxCols) * emotionW + DJEmotionPageViewPadding;
        emotionView.y = (i / DJEmotionPageViewMaxCols) * emotionH + DJEmotionPageViewPadding;
        emotionView.width = emotionW;
        emotionView.height = emotionH;
    }

}


@end

最终效果：