OC에서 자주 사용하는 공통 방법
1. 총 디스크 공간 계산 (단위 mb)
- (float)diskSize {
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemSize];
size = [number floatValue]/1024/1024;
}
return size;
}
2. 디스크 사용 가능한 공간 계산 (단위 mb)
- (float)diskFreeSize {
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];
size = [number floatValue]/1024/1024;
}
return size;
}
3. 파일 크기 계산(byte)
- (float)fileSize {
NSString *path = [[NSBundle mainBundle] pathForResource:@"sf_muni" ofType:@"pdf"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:path])
return 0;
return [[fileManager attributesOfItemAtPath:path error:nil] fileSize];
}
4. 문자열 머리글자 가져오기(문자나 한자 모두 가능)
- (NSString *)firstCharacterWithString:(NSString *)string {
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
}
5. 배열의 요소를 알파벳별로 정렬
- (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{
if (array.count == 0) {
return nil;
}
for (id obj in array) {
if (![obj isKindOfClass:[NSString class]]) {
return nil;
}
}
UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
// 27
for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {
NSMutableArray *obj = [NSMutableArray array];
[objects addObject:obj];
}
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
//
NSInteger lastIndex = -1;
for (int i = 0; i < array.count; i++) {
NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
[[objects objectAtIndex:index] addObject:array[i]];
lastIndex = index;
}
//
for (int i = 0; i < objects.count; i++) {
NSMutableArray *obj = objects[i];
if (obj.count == 0) {
[objects removeObject:obj];
}
}
//
for (NSMutableArray *obj in objects) {
NSString *str = obj[0];
NSString *key = [self firstCharacterWithString:str];
[keys addObject:key];
}
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setObject:objects forKey:keys];
return dic;
}
// ( )
- (NSString *)firstCharacterWithString:(NSString *)string{
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
}
6. 현재 시간 가져오기
//NSString *format = @"yyyy-MM-dd HH:mm:ss" @"yyyy MM dd HH mm ss "
- (NSString *)currentDateWithFormat:(NSString *)format{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
return [dateFormatter stringFromDate:[NSDate date]];
}
7. 16진수 색상코드가 UIColor 객체로 변환
- (UIColor *)colorWithHexString:(NSString *)color{
NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
// String should be 6 or 8 characters
if ([cString length] < 6) {
return [UIColor clearColor];
}
// strip "0X" or "#" if it appears
if ([cString hasPrefix:@"0X"])
cString = [cString substringFromIndex:2];
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];
if ([cString length] != 6)
return [UIColor clearColor];
// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;
//r
NSString *rString = [cString substringWithRange:range];
//g
range.location = 2;
NSString *gString = [cString substringWithRange:range];
//b
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}
8. 그림에 필터
//filterName
// --> CIPhotoEffectInstant --> CIPhotoEffectMono
// --> CIPhotoEffectNoir --> CIPhotoEffectFade
// --> CIPhotoEffectTonal --> CIPhotoEffectProcess
// --> CIPhotoEffectTransfer --> CIPhotoEffectChrome
- (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}
9. 이미지 모호화 처리
//blurName
// CIGaussianBlur --->
// CIBoxBlur ---> (Available in iOS 9.0 and later)
// CIDiscBlur ---> (Available in iOS 9.0 and later)
// CIMedianFilter ---> , , radius(Available in iOS 9.0 and later)
// CIMotionBlur ---> , (Available in iOS 9.0 and later)
- (UIImage *)blurWithOriginalImage:(UIImage *)image blurName:(NSString *)name radius:(NSInteger)radius{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter;
if (name.length != 0) {
filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
if (![name isEqualToString:@"CIMedianFilter"]) {
[filter setValue:@(radius) forKey:@"inputRadius"];
}
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}else{
return nil;
}
}
10. 전체 화면 캡처
- (UIImage *)shotScreen{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
UIGraphicsBeginImageContext(window.bounds.size);
[window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
11. IP 주소 가져오기
#import
#import
- (NSString *)getIPAddress {
NSString *address = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
success = getifaddrs(&interfaces);
if (success == 0) {
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
freeifaddrs(interfaces);
return address;
}
12. 문자열에 중국어가 있는지 판단
- (BOOL)isHaveChineseInString:(NSString *)string{
for(NSInteger i = 0; i < [string length]; i++){
int a = [string characterAtIndex:i];
if (a > 0x4e00 && a < 0x9fff) {
return YES;
}
}
return NO;
}
13. 문자열이 순수 숫자인지 판단
- (BOOL)isAllNum:(NSString *)string{
unichar c;
for (int i=0; i
14. 텍스트 높이 계산
- (float)calculateHeightWithContent:(NSString *)content andWidth:(float)width andFontSize:(float)fontSize {
// , ,
CGSize size = CGSizeMake(width,2000);
//
NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]};
//
CGRect summaryRect = [content boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil];
return summaryRect.size.height;
}
15. 화면에 지정된 UItable ViewCell의 실제 위치 가져오기
- (CGRect)cellRectInWindow:(NSIndexPath *)index {
CGRect rectInTableView = [self.tableView rectForRowAtIndexPath:index];
return [self.tableView convertRect:rectInTableView toView:[self.tableView superview]];
}
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