Skip to content

Grammar

layoutSubviews viewDidLayoutSubviews#

https://ios-daniel-yang.tistory.com/93

Safe Area의 top와 bottom 높이값 구하기#

if #available(iOS 15.0, *) {
    let window = UIApplication.shared.currentScene?.keyWindow
    let topPadding = window.safeAreaInsets.top
    let bottomPadding = window.safeAreaInsets.bottom
}

출처

https://stackoverflow.com/questions/46829840/get-safe-area-inset-top-and-bottom-heights

Status bar 높이 구하기#

let height = view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0

출처

https://stackoverflow.com/questions/25973733/status-bar-height-in-swift

Color 다크모드 코드로 설정하기#

static func systemModeColor() -> UIColor {
    let dynamicColor = UIColor(dynamicProvider: { (traitCollection) -> UIColor in
        if traitCollection.userInterfaceStyle == .dark {
            return UIColor.red
        }else {
            return UIColor.green
        }
    })
    return dynamicColor
}

출처

https://forums.developer.apple.com/forums/thread/122468

배열 인덱스와 값 출력#

let seoul = ["Jane", "Kim"]
for (idx, name) in seoul.enumerated() {
    print("\(idx), \(name)")
}

배열 일치하는 값의 인덱스 찾기#

let seoul = ["Jane", "Kim"]
print("\(seoul.firstIndex(of: "Kim")!)")

배열 내림차순으로 정렬후 인덱스 순으로 배열 반환#

let emergency = [3, 76, 24]
let result = emergency.map {
    emergency.sorted(by: > ).firstIndex(of: $0)!
}
print(result)

배열 내림차순으로 정렬후 순차적으로 값 뽑기#

let emergency = [3, 76, 24]
for i in emergency.sorted(by: >) {
    print(i)
}

배열 중복 인덱스 제거#

userInfo.removeAll(where: { $0.name == "민이" })

배열의 특정 index 찾기#

if let index = userInfo.firstIndex(where: { $0.name == "민이" }) {
    print(userInfo[index].phone)
}

unix 와 같은 13자리 timestamp 얻기#

// ex1)
let currentDate = NSNumber(value:Int64(Date().timeIntervalSince1970 * 1000))

// ex2)
extension Date {

    func toMillis() -> NSNumber {
        return NSNumber(value:Int64(timeIntervalSince1970 * 1000))
    }

    var timestamp: Int64 {
        Int64(timeIntervalSince1970 * 1000)
    }
}

long long milliseconds = (long long)([[NSDate date] timeIntervalSince1970] * 1000.0);

CodingKeys 사용법#

struct Login: Codable {
    let code: UInt
    let msg: String
    let data: LoginInfo
    enum CodingKeys: String, CodingKey {
        case code = "code"
        case msg = "msg"
        case data = "data"
    }
}

struct LoginInfo: Codable {
    let userID: String
    let username: String
    enum CodingKeys: String, CodingKey {
        case userID = "userID"
        case username = "username"
    }
}

string to enum#

public enum LoginType: String {
    case google="GOOGLE"
    case facebook="FACEBOOK"
    case apple="APPLE"
    case guest="GUEST"
}

print(LoginType.google.rawValue) //GOOGLE

출처

https://stackoverflow.com/questions/24701075/swift-convert-enum-value-to-string

int to enum#

public enum LanguageCode : Int{
    case ko
    case en
    case ja
    case zhcn
    case zhtw
    case th
    case vi
    case es
    case pt
    case fr
    case de
    case ru

    var description: String {
        return String(describing: self)
    }
}

print(languageCode.rawValue) //0
print(languageCode.description) //ko

출처

https://stackoverflow.com/questions/28461133/swift-enum-both-a-string-and-an-int

UUID 생성하기#

UUID.init().uuidString

+ (NSString *) createUUID
{
    NSString *uuid = [[NSUUID UUID] UUIDString];

    return uuid;
}
//output : 61237D34-C6ED-4AA7-8151-A42053C953B4

[objc] NSURL 사용법#

1. NSURL 속성#

예제#

NSString *strUrl = @"https://www.api.com/api/info?t=123&sign=test123";
NSURL *reqURL = [NSURL URLWithString:strUrl];
NSLog(@"%@", [reqURL host]);
NSLog(@"%@", [reqURL path]);
NSLog(@"%@", [reqURL query]);

2. NSURL 에서 NSString 으로 변환#

NSString *myString = myURL.absoluteString;

출처

https://stackoverflow.com/questions/8082719/convert-an-nsurl-to-an-nsstring

md5 encode#

import CommonCrypto

func MD5(_ input: String) -> String? {
    let length = Int(CC_MD5_DIGEST_LENGTH)
    var digest = [UInt8](repeating: 0, count: length)
    if let d = input.data(using: .utf8) {
        _ = d.withUnsafeBytes { body -> String in
            CC_MD5(body.baseAddress, CC_LONG(d.count), &digest)
            return ""
        }
    }
    return (0..<length).reduce("") {
        $0 + String(format: "%02x", digest[$1])
    }
}

#import <CommonCrypto/CommonDigest.h>

+ (NSString *) md5:(NSString *) input
{
    const char *cStr = [input UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (CC_LONG)strlen(cStr), digest ); // This is the md5 call

    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];

    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
    [output appendFormat:@"%02x", digest[i]];

    return  output;
}

[objc] 콜백 리스너 예제(Blocks Sample Code)#

objc 에서 콜백함수에 대한 이벤트리스너를 만드려면

  1. block(^)
  2. selector
  3. noti
  4. delegate

가 있다고 한다. 현재 상황에서 나에게 필요한건 block 이었기 때문에 혹시 필요하신 분들을 위해 샘플코드를 제공합니다.

@implementation
-(void)doSomething:(void (^)(BOOL, int))completionBlock
{
    NSLog(@"Do Something first");

    completionBlock(YES, 1);
    completionBlock(NO, 2);

    NSLog(@"Then may be something else");
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self doSomething:^(BOOL isOk, int code) {
        //code
    }]        
}
@end

헤더
typedef void (^responseBlock)(BOOL, int);

@implementation
-(void)doSomething:(responseBlock)completionBlock
{
    NSLog(@"Do Something first");

    completionBlock(YES, 1);
    completionBlock(NO, 2);

    NSLog(@"Then may be something else");
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self doSomething:^(BOOL isOk, int code) {
        //code
    }]        
}
@end

isKindOfClass 사용법#

딕셔너리에 string int long 등이 있을때 element 타입체크하기.

for(NSString *key in mDict)
{
  id value = [mDict objectForKey:key];
  if([value isKindOfClass:[NSString class]]) {
    NSString *temp = (NSString*)value;
    NSLog(@"%@",temp);
  }
  else if([value isKindOfClass:[NSNumber class]]) {
    NSNumber *numTemp = (NSNumber*)value;
    NSString *strTemp = [numTemp stringValue];
    NSLog(@"%@",strTemp);
  }
}