# ios常用的一些判断
## 根据日起计算是周几
```
+ (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];
}
```
## 把时间戳转化为字符串
### 传个时间转化为字符串
```
+ (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];
}
```
### 计算时间差
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
unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ;
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 @"";
}
```
## 动态计算行高
根据字符串的实际内容大小，在固定的宽度和大小的情况下，动态计算行高
```
+ (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的版本号
```
+ (double)getCurrentIOS {
return [[[UIDevice currentDevice] systemVersion] doubleValue];
}
+ (CGSize)getScreenSize {
return [[UIScreen mainScreen] bounds].size;
}
```
## 目录
### 找到沙盒的路径
```
+ (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];
}
```
### 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;
}
```
### 创建指定的缓存
```
+ (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的大小
```
+ (long long) fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return 0;
}
```
### 获取缓存的大小
```
+ (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);
}
```
## 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]];
}
```
## 正则判断
### 手机格式的正则判断
```
+ (BOOL)isMobileNumber:(NSString *)mobileNum
{
/**
* 手机号码
* 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
* 联通：130,131,132,152,155,156,185,186
* 电信：133,1349,153,180,189,181
* 新增：14_,17_
*/
NSString * MOBIL = @"^1(3[0-9]|4[0-9]|5[0-35-9]|7[0-9]|8[025-9])\\d{8}$";
/**
10 * 中国移动：China Mobile
11 * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
12 */
NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[2378])\\d)\\d{7}$";
/**
15 * 中国联通：China Unicom
16 * 130,131,132,152,155,156,185,186
17 */
NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
/**
20 * 中国电信：China Telecom
21 * 133,1349,153,180,189,181(增加)
22 */
NSString * CT = @"^1((33|53|8[019])[0-9]|349)\\d{7}$";
/**
25 * 大陆地区固话及小灵通
26 * 区号：010,020,021,022,023,024,025,027,028,029
27 * 号码：七位或八位
28 */
// NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBIL];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum]
|| [regextestcm evaluateWithObject:mobileNum]
|| [regextestct evaluateWithObject:mobileNum]
|| [regextestcu evaluateWithObject:mobileNum])) {
return YES;
}
return NO;
}
```
### 密码正则判断6-16 大小写数字
```
+ (BOOL) isPassword:(NSString *)password;
{
NSRegularExpression *regularexpression = [[NSRegularExpression alloc]
initWithPattern:@"^[a-zA-Z0-9]{6,16}$"
options:NSRegularExpressionCaseInsensitive
error:nil];
NSUInteger numberofMatch = [regularexpression numberOfMatchesInString:password
options:NSMatchingReportProgress
range:NSMakeRange(0, password.length)];
if(numberofMatch > 0)
return YES;
return NO;
```
### 邮箱的正则判断
```
+ (BOOL) isEmail:(NSString *)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
if ([emailTest evaluateWithObject:email]) {
return YES;
}
return NO;
}
```
### 身份证正则判断
```
+ (BOOL) isIdentityCard: (NSString *)identityCard
{
NSString *idnum = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",idnum];
return [identityCardPredicate evaluateWithObject:identityCard];
}
```
