KentarouKanno

BOOL isFrontViewShowing;


- (void) viewDidLoad{
    [super viewDidLoad];

    isFrontViewShowing = YES;

    UIButton *flipBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    flipBtn.frame = CGRectMake(100, 100, 100, 40);

KentarouKanno

// UIViewをUIImageに変換する(objective-c)
- (UIImage*)convertUIimageFromUIview:(UIView*)view {
    
    UIGraphicsBeginImageContext(view.frame.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

KentarouKanno

現在時刻のミリ秒表示(Swift4)

func nowTime() -> String { /* 2018-04-30 19:33:32.265253+0900 */
    let format = DateFormatter()
    format.dateFormat = "yyyy/MM/dd HH:mm:ss.SSS"
    return format.string(from: Date())
}

KentarouKanno

var a: AnyObject? = 1
var c = (a as! NSNumber)

var array = ["a","b","c"]

var b = array[c.integerValue]
//=> b = "b"

var d = array[(a as! NSNumber).integerValue + 1]
//=> d = "c"

KentarouKanno

#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>

@interface ViewController ()<CBCentralManagerDelegate>
@end

@interface ViewController () {
@property (nonatomic) CBCentralManager *bluetoothManager;
@end

KentarouKanno

let limitByte: Int = 1000000
var compressionQuality: CGFloat = 1.0
var data: NSData!
            
repeat {
    data = UIImageJPEGRepresentation(images,compressionQuality)
    print("Quality\((compressionQuality)) = \(data!.length)")
    compressionQuality -= 0.1
} while data?.length > limitByte

KentarouKanno

// ViewController

var focusCellIndex: NSIndexPath!

func keyboardDidShow(notification: NSNotification) {
    
    let rect = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
    UIView.animateWithDuration(0, animations: {
        self.mainTableView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.viewHeight - rect.height)
        }) { (boolValue) -> Void in

KentarouKanno

@IBDesignable & @IBInspectable

★ UIView

import UIKit

@IBDesignable class DesignableView: UIView {
    

KentarouKanno

// 配列を区切り文字で連結

(Obj-C)
NSArray *array = @[@"1",@"2",@"3",@"4",@"5"];
NSString *joinedString = [array componentsJoinedByString:@","];

(Swift)
let joinedString = ["1", "2", "3", "4", "5"].joinWithSeparator(",")
//=> "1,2,3,4,5"

KentarouKanno

// Check UINavigationController Pop or UIViewController dismiss

override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)
    
    let vcs = self.navigationController?.viewControllers
    if ((vcs?.contains(self)) == nil) {
        print("UINavigationController Pop")
    } else {