edwardean

#import <sys/sysctl.h>

static CFTimeInterval processStartTime() {
    size_t len = 4;
    int mib[len];
    struct kinfo_proc kp;

    sysctlnametomib("kern.proc.pid", mib, &len);
    mib[3] = getpid();
    len = sizeof(kp);

edwardean

NSString *asss = @"hello";
    for (NSInteger i = 0; i < asss.length; i++) {
        printf("0x%x, ",[asss characterAtIndex:i]);
    }

edwardean

- (UIImage*)screenshot
{
    // Create a graphics context with the target size
    // On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
    // On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
    CGSize imageSize = [[UIScreen mainScreen] bounds].size;
    if (NULL != UIGraphicsBeginImageContextWithOptions)
        UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    else
        UIGraphicsBeginImageContext(imageSize);

edwardean

extension UIColor {
  static var radom: UIColor {
        #if swift(>=4.2)
        return UIColor(red: .random(in: 0...1),
        green: .random(in: 0...1),
        blue: .random(in: 0...1), alpha: 1)
        #else
        return UIColor(red: CGFloat(arc4random_uniform(256) / 255),
                       green: CGFloat(arc4random_uniform(256) / 255),
                       blue: CGFloat(arc4random_uniform(256) / 255), alpha: 1)

edwardean

extension String {
    func removingWhitespaces() -> String {
        return components(separatedBy: .whitespaces).joined()
    }
}

edwardean

# Under the projects folder -> Build Phases -> click on add new build phase on top left corner -> select New Run Script Phase
# Select the Run Script from the dropdown of Build Phase
# let the Shell be the default (/bin/sh)
# Paste below code in the place provided
# This code run every time the project is build

# To create warning (TODO, FIXME) & error msgs (ERROR) comment tags
TAGS="TODO|FIXME"
ERRORTAG="ERROR"
find "${SRCROOT}" \( -name "*.h" -or -name "*.m" -or -name "*.swift" \) -print0 | \

edwardean

• 统计从指定日期到现在提交的代码行数,并且排除Pods目录的更改:

git log --author="$(git config --get user.name)" --since='2018-01-01' --pretty=tformat: --numstat ":(exclude)Pods" | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %s\n", add, subs, loc }' -

• 统计从指定日期到现在的提交次数：

git log --author="$(git config --get user.name)" --since='2018-01-01' --no-merges --oneline | wc -l

edwardean

addTarget(self, action: #selector(valueChanged(sender:)), for: [.valueChanged])

@objc private func valueChanged(sender: UISwitch) {
    CATransaction.setCompletionBlock { [onChange] in
        onChange?(sender.isOn)
    }
}

The documentation says the block is guaranteed to be called even if there are no animations or the animation was removed. It makes it very safe to use.

edwardean

func blurImage(_ image: UIImage, forRect rect: CGRect, radius: Float) -> UIImage? {

    let context = CIContext(options: nil)
    let inputImage = CIImage(cgImage: image.cgImage!)

    guard let filter = CIFilter(name: "CIGaussianBlur") else {
        return nil
    }

    filter.setValue(inputImage, forKey: kCIInputImageKey)

edwardean

http://www.markj.net/iphone-uiimage-pixel-color/

- (UIColor*) getPixelColorAtLocation:(CGPoint)point {
UIColor* color = nil;
CGImageRef inImage = self.image.CGImage;
// Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue
CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];
if (cgctx == NULL) { return nil; /* error */ }

size_t w = CGImageGetWidth(inImage);