1、时间计算，大多数我们从后台取回的时间字段都为NSNumber ， 需求大多数都是以信息发布的时间都是以label显示出（多少分钟前发布等显示）
先把取到的NSNumber时间转换成字符串
/*** 时间nuber转时间字符串*/
+ (NSString *)numberWithConversion:(NSNumber *)number {
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"beijing"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"yyyyMMddHHmmss"];
// 毫秒值转化为秒
NSDate* dateTime = [NSDate dateWithTimeIntervalSince1970:[number doubleValue]/ 1000.0];
return [formatter stringFromDate:dateTime];
}
计算发布时间
/**
* 计算发布时间
*
* @param theDate 发布时间
* @param servertime 服务器时间
*
* @return 计算后的时间
*/
+ (NSString*)intervalSinceNow:(NSString*)theDate servertime:(NSString *)servertime {
NSDateFormatter*date=[[NSDateFormatter alloc] init];
[date setDateFormat:@"yyyyMMddHHmmss"];
NSDate*dateStr=[date dateFromString:theDate];
NSTimeInterval lateTime=[dateStr timeIntervalSince1970]*1;
NSDate* dat = [date dateFromString:servertime];
NSTimeInterval nowTime=[dat timeIntervalSince1970]*1;
NSString*timeString=@"";
NSTimeInterval showTime=nowTime-lateTime;
if(showTime/3600<1) {//发表在一小时之内
if(showTime/60<1) {
timeString=@"刚刚发布";
} else {
timeString = [NSString stringWithFormat:@"%f", showTime/60];
timeString = [timeString substringToIndex:timeString.length-7];
timeString=[NSString stringWithFormat:@"%@分钟前发布", timeString];
}
} else if(showTime/3600>1&&showTime/86400<1) {//在一小时以上24小以内
timeString = [NSString stringWithFormat:@"%f", showTime/3600];
timeString = [timeString substringToIndex:timeString.length-7];
timeString=[NSString stringWithFormat:@"%@小时前发布", timeString];
} else {//发表在24小时以上
timeString = [NSString stringWithFormat:@"%f", showTime/86400];
timeString = [timeString substringToIndex:timeString.length-7];
timeString=[NSString stringWithFormat:@"%@天前发布", timeString];
}
return timeString;
}
UIlabel段落的显示（显示结果）
最终显示的结果
直接上代码：
//设置Lable首行缩进
NSString * headerData = [YHHTools cancelSpaces:miaoReadModel.viewpoint];
if (headerData.length > 196) {
self.viewpointLable.text = [NSString stringWithFormat:@"%@....",[headerData substringToIndex:196]];
}else {
self.viewpointLable.text = headerData;
}
NSMutableAttributedString*text = [[NSMutableAttributedString alloc]initWithString:self.viewpointLable.text];
NSMutableParagraphStyle*style = [[NSMutableParagraphStyle alloc]init];
// style.headIndent = 0; //缩进
style.firstLineHeadIndent = 30;
style.lineSpacing=6;//行距
style.alignment=NSTextAlignmentLeft;
//需要设置的范围
NSRange range = NSMakeRange(0,self.viewpointLable.text.length);
[text addAttribute:NSParagraphStyleAttributeName value:style range:range];
self.viewpointLable.attributedText= text;
当然我这些字段都是由后台传回，所以传回的文字经常会出现\r\n这样的标示会导致在计算cell高度的时候有写偏差就需要取消字符的换行
/**
* 取消字符串的换行空格
*
*
* @return 取消后的字符串
*/
+ (NSString *)cancelSpaces:(NSString *)string {
NSString * headerData = string;
headerData = [headerData stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; //去除掉首尾的空白字符和换行字符
headerData = [headerData stringByReplacingOccurrencesOfString:@"\r" withString:@""];
headerData = [headerData stringByReplacingOccurrencesOfString:@"\n" withString:@""];
return headerData;
}
