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//
// CustomStudyEntity.m
// Lighting
//
// Created by 曹云霄 on 2016/12/5.
// Copyright © 2016年 上海勾芒科技有限公司. All rights reserved.
//
#import "CustomStudyEntity.h"
#import <AVFoundation/AVFoundation.h>
@implementation CustomStudyEntity
- (CGFloat)contentHeight
{
if (!_contentHeight) {
_contentHeight = [self calculateStudyIntroductionHeight:self.content]+74;
}
return _contentHeight;
}
- (CGFloat)teacherIntroHeight
{
if (!_teacherIntroHeight) {
_teacherIntroHeight = [self calculateStudyIntroductionHeight:self.teacherIntro]+106;
}
return _teacherIntroHeight;
}
- (CGFloat)personHeight
{
if (!_personHeight) {
_personHeight = [self calculateStudyIntroductionHeight:self.suitabler]+74;
}
return _personHeight;
}
- (NSString *)videoLength
{
if (!_videoLength) {
_videoLength = [self calculateVideoLength];
}
return _videoLength;
}
#pragma mark - 计算视频长度
- (NSString *)calculateVideoLength
{
if ([self.attachment.fileUrl rangeOfString:@".mp4"].location != NSNotFound) {
NSURL *movieURL = [NSURL URLWithString:self.attachment.fileUrl];
NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO]
forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:movieURL options:opts]; // 初始化视频媒体文件
NSInteger interval = urlAsset.duration.value / urlAsset.duration.timescale; // 获取视频总时长,单位秒
NSUInteger secondPerDay = 24 * 60 * 60;
NSUInteger secondPerHour = 60 * 60;
NSUInteger secondPerMinute = 60;
// 剩余小时不应该大于24小时，所以应该先除去满足一天的秒数，再计算还剩下多少小时
NSInteger hour = interval % secondPerDay / secondPerHour;
// 剩余分钟数与上面同理
NSInteger minute = interval % secondPerHour / secondPerMinute;
// 剩余秒数直接等于秒数对每分钟秒数所取的余数
NSInteger second = interval % secondPerMinute;
NSMutableString *string = [NSMutableString string];
if (hour) {
[string appendString:[NSString stringWithFormat:@"%02zd:",hour]];
}
[string appendString:[NSString stringWithFormat:@"%02zd:%02zd",minute,second]];
return string;
}
return nil;
}
#pragma mark - 计算高度
- (CGFloat)calculateStudyIntroductionHeight:(NSString *)content
{
return [content heightWithWidth:ScreenWidth*2/3-28*2 andFont:12].height;
}
@end