OC实现简单的图文混排

效果图

- (void)showCity:(NSString *)cityname  
{  
    //实现富文本  
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:cityname attributes:nil];  
    //进行图文混排  
    NSTextAttachment *textAttachment = [[NSTextAttachment alloc] initWithData:nil ofType:nil];  
    textAttachment.image = [UIImage imageNamed:@"f_flagdown02@2x"];  
    textAttachment.bounds =CGRectMake(0,0, 11,8);  
    NSAttributedString * textAttachmentString = [NSAttributedString attributedStringWithAttachment:textAttachment];  
    //判断选择的城市名称长度是否大于5个字符的长度，如果大于五个字符就取前四个字符，然后再在最后添加一个图标  
    if (string.length >=5) {  
        //去前四个字符  
        NSAttributedString *str = [string attributedSubstringFromRange:NSMakeRange(0,4)];  
        //将NSAttributedString类型转换成NSString类型  
        NSString *cityString = [str string];  
        string = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@..",cityString] attributes:nil];  
    }  
  
    //在城市名称后插入图片  
    [string insertAttributedString:textAttachmentString atIndex:string.length];  
    //自定义按钮  
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];  
    btn.frame =CGRectMake(0,0, 70,30);  
    [btn addTarget:self action:@selector(navBtnCLick)forControlEvents:UIControlEventTouchUpInside];  
    UILabel *lbText = [[UILabel alloc] initWithFrame:CGRectMake(0,0, btn.frame.size.width+10, btn.frame.size.height)];  
    lbText.attributedText = string;  
    lbText.textColor = [UIColorwhite Color];  
    lbText.font = [UIFont systemFontOfSize:13];  
    [btn addSubview:lbText];  
    btn.backgroundColor = [UIColor clearColor];  
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];  
}