iOS封装常用的方法

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//根据日期算出周几

+ (NSString*)weekdayStringFromDate:(NSDate*)inputDate

{

NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"周日", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];

[calendar setTimeZone: timeZone];

NSCalendarUnit calendarUnit = NSWeekdayCalendarUnit;

NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];

return [weekdays objectAtIndex:theComponents.weekday];

}

//转化为时间字符串

+ (NSString *)dateStringFromNumberTimer:(NSString *)timerStr {

//转化为Double

double t = [timerStr doubleValue];

//计算出距离1970的NSDate

NSDate *date = [NSDate dateWithTimeIntervalSince1970:t];

//转化为时间格式化字符串

//NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];

NSDateFormatter *df = [[NSDateFormatter alloc] init];

df.dateFormat = @"yyyy-MM-dd HH:mm:ss";

//转化为时间字符串

return [df stringFromDate:date];

}

//动态计算行高

//根据字符串的实际内容的多少在固定的宽度和字体的大小，动态的计算出实际的高度

+ (CGFloat)textHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)size{

if ([MZLUtility getCurrentIOS] >= 7.0) {

//iOS7之后

第一个参数:预设空间宽度固定高度预设一个最大值

第二个参数:行间距如果超出范围是否截断

第三个参数:属性字典可以设置字体大小

NSDictionary *dict = @{NSFontAttributeName:[UIFont systemFontOfSize:size]};

CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];

//返回计算出的行高

return rect.size.height;

}else {

//iOS7之前

1.第一个参数设置的字体固定大小

2.预设宽度和高度宽度是固定的高度一般写成最大值

3.换行模式字符换行

CGSize textSize = [text sizeWithFont:[UIFont systemFontOfSize:size] constrainedToSize:CGSizeMake(textWidth, MAXFLOAT) lineBreakMode:NSLineBreakByCharWrapping];

return textSize.height;//返回计算出得行高

}

//获取iOS版本号

+ (double)getCurrentIOS {

return [[[UIDevice currentDevice] systemVersion] doubleValue];

}

+ (CGSize)getScreenSize {

return [[UIScreen mainScreen] bounds].size;

}

//获得当前系统时间到指定时间的时间差字符串,传入目标时间字符串和格式

+(NSString*)stringNowToDate:(NSString*)toDate formater:(NSString*)formatStr

{

NSDateFormatter *formater=[[NSDateFormatter alloc] init];

if (formatStr) {

[formater setDateFormat:formatStr];

}

else{

[formater setDateFormat:[NSString stringWithFormat:@"yyyy-MM-dd HH:mm:ss"]];

}

NSDate *date=[formater dateFromString:toDate];

return [self stringNowToDate:date];

}

//获得到指定时间的时间差字符串,格式在此方法内返回前自己根据需要格式化

+(NSString*)stringNowToDate:(NSDate*)toDate

{

//创建日期 NSCalendar对象

NSCalendar *cal = [NSCalendar currentCalendar];

//得到当前时间

NSDate *today = [NSDate date];

//用来得到具体的时差,位运算

if (toDate && today) {//不为nil进行转化

NSDateComponents *d = [cal components:unitFlags fromDate:today toDate:toDate options:0 ];

//NSString *dateStr=[NSString stringWithFormat:@"%d年%d月%d日%d时%d分%d秒",[d year],[d month], [d day], [d hour], [d minute], [d second]];

NSString *dateStr=[NSString stringWithFormat:@"%02ld:%02ld:%02ld",[d hour], [d minute], [d second]];

return dateStr;

}

return @"";

}

//MD5加密字符串

NSString * MD5Hash(NSString *aString) {

const char *cStr = [aString UTF8String];

unsigned char result[16];

CC_MD5( cStr, (CC_LONG)strlen(cStr), result );

return [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",

result[0], result[1], result[2], result[3],

result[4], result[5], result[6], result[7],

result[8], result[9], result[10], result[11],

result[12], result[13], result[14], result[15]];

}

//获取一个文件在沙盒Library/Caches/目录下的路径

+ (NSString *)getFullPathWithFile:(NSString *)urlName {

//先获取沙盒中的Library/Caches/路径

NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

NSString *myCacheDirectory = [docPath stringByAppendingPathComponent:@"MyCaches"];

//检测MyCaches文件夹是否存在

if (![[NSFileManager defaultManager] fileExistsAtPath:myCacheDirectory]) {

//不存在那么创建

[[NSFileManager defaultManager] createDirectoryAtPath:myCacheDirectory withIntermediateDirectories:YES attributes:nil error:nil];

}

//用md5进行加密转化为一串十六进制数字 (md5加密可以把一个字符串转化为一串唯一的用十六进制表示的串)

NSString * newName = MD5Hash(urlName);

//拼接路径

return [myCacheDirectory stringByAppendingPathComponent:newName];

}

//检测缓存文件是否超时

+ (BOOL)isTimeOutWithFile:(NSString *)filePath timeOut:(double)timeOut {

//获取文件的属性

NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];

//获取文件的上次的修改时间

NSDate *lastModfyDate = fileDict.fileModificationDate;

//算出时间差获取当前系统时间和 lastModfyDate时间差

NSTimeInterval sub = [[NSDate date] timeIntervalSinceDate:lastModfyDate];

if (sub < 0) {

sub = -sub;

}

//比较是否超时

if (sub > timeOut) {

//如果时间差大于设置的超时时间那么就表示超时

return YES;

}

return NO;

}

//清除缓存

+ (void) resetCache {

[[NSFileManager defaultManager] removeItemAtPath:[MZLCache cacheDirectory] error:nil];

}

//缓存目录

+ (NSString*) cacheDirectory {

NSArray* paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);

NSString *cacheDirectory = [paths objectAtIndex:0];

cacheDirectory = [cacheDirectory stringByAppendingPathComponent:@"MZLCaches"];

return cacheDirectory;

}

//删除指定的缓存

+ (NSData*) objectForKey:(NSString*)key {

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *filename = [self.cacheDirectory stringByAppendingPathComponent:key];

if ([fileManager fileExistsAtPath:filename])

{

NSDate *modificationDate = [[fileManager attributesOfItemAtPath:filename error:nil] objectForKey:NSFileModificationDate];

if ([modificationDate timeIntervalSinceNow] > cacheTime) {

[fileManager removeItemAtPath:filename error:nil];

} else {

NSData *data = [NSData dataWithContentsOfFile:filename];

return data;

}

return nil;

}

//创建指定缓存

+ (void) setObject:(NSData*)data forKey:(NSString*)key {

NSFileManager *fileManager = [NSFileManager defaultManager];

NSString *filename = [self.cacheDirectory stringByAppendingPathComponent:key];

BOOL isDir = YES;

if (![fileManager fileExistsAtPath:self.cacheDirectory isDirectory:&isDir]) {

[fileManager createDirectoryAtPath:self.cacheDirectory withIntermediateDirectories:NO attributes:nil error:nil];

}

NSError *error;

@try {

[data writeToFile:filename options:NSDataWritingAtomic error:&error];

}

@catch (NSException * e) {

//TODO: error handling maybe

}

//获取某个路径下文件大小

+ (long long) fileSizeAtPath:(NSString*) filePath{

NSFileManager* manager = [NSFileManager defaultManager];

if ([manager fileExistsAtPath:filePath]){

return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];

}

return 0;

}

//获取缓存大小

+ (float ) folderSizeAtPath:(NSString*) folderPath{

NSFileManager* manager = [NSFileManager defaultManager];

if (![manager fileExistsAtPath:folderPath])

return 0;

NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

NSString* fileName;

long long folderSize = 0;

while ((fileName = [childFilesEnumerator nextObject]) != nil){

NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

folderSize += [MZLCache fileSizeAtPath:fileAbsolutePath];

}

return folderSize/(1024.0*1024.0);

}

//判断字符是否为空

+(BOOL)isNull:(NSString*)str

{

if(str ==nil)

{

returnYES;

}

if([strisEqualToString:@""])

{

returnYES;

}

returnNO;

}

//返回时间

+ (NSString *)compareCurrentTime:(NSString *)dateString

{

//把字符串转为NSdate

NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *timeDate = [dateFormatterdateFromString:dateString];

//得到与当前时间差

NSTimeInterval timeInterval = [timeDatetimeIntervalSinceNow];

timeInterval = -timeInterval;

//标准时间和北京时间差8个小时

timeInterval = timeInterval - 8*60*60;

long temp =0;

NSString *result;

if (timeInterval <60) {

result = [NSStringstringWithFormat:@"刚刚"];

}

elseif((temp = timeInterval/60) <60){

result = [NSStringstringWithFormat:@"%ld分钟前",temp];

}

elseif((temp = temp/60) <24){

result = [NSStringstringWithFormat:@"%ld小时前",temp];

}

elseif((temp = temp/24) <30){

result = [NSStringstringWithFormat:@"%ld天前",temp];

}

elseif((temp = temp/30) <12){

result = [NSStringstringWithFormat:@"%ld月前",temp];

}

else{

temp = temp/12;

result = [NSStringstringWithFormat:@"%ld年前",temp];

}

return result;

}

/**通过行数,返回更新时间 */

+ (NSString *)updateTimeForRow:(NSInteger)row {

// 获取当前时时间戳 1466386762.345715十位整数 6位小数

NSTimeInterval currentTime = [[NSDatedate] timeIntervalSince1970];

// 创建歌曲时间戳(后台返回的时间一般是13位数字)

// NSTimeInterval createTime = row/;

// 时间差

NSTimeInterval time = currentTime - row;

// 秒转小时

NSInteger hours = time/3600;

if (hours<24) {

return [NSStringstringWithFormat:@"%ld小时前",hours];

}

//秒转天数

NSInteger days = time/3600/24;

if (days <30) {

return [NSStringstringWithFormat:@"%ld天前",days];

}

//秒转月

NSInteger months = time/3600/24/30;

if (months <12) {

return [NSStringstringWithFormat:@"%ld月前",months];

}

//秒转年

NSInteger years = time/3600/24/30/12;

return [NSStringstringWithFormat:@"%ld年前",years];

}

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