junyixin

extension Array where Element: Comparable {
    mutating func mergeSort(_ begin: Index, _ end: Index) {
        var tmp: [Element] = []
        tmp.reserveCapacity(count)
        
        //local function
        func merge(_ begin: Index, _ mid: Index, _ end: Index) {
            tmp.removeAll(keepingCapacity: true)
            
            var i = begin

junyixin

- (void)saveImageToPhotos:(UIImage *)image {
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:),nil);
}

-  (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error == nil) {
        NSLog(@"保存成功");
    } else {
        NSLog(@"失败");
    }

junyixin

# buble sort

def bubleSort(arrList):
  for passnum in range(len(arrList)-1, 0, -1):
    for i in range(passnum):
      if arrList[i] > arrList[i+1]:
        temp = arrList[i]
        arrList[i] = arrList[i+1]
        arrList[i+1] = temp
  

junyixin

//回调
static void displayStatusChanged(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo) {
    // "com.apple.springboard.lockcomplete" 通知总是接在 "com.apple.springboard.lockstate" 通知后面
    CFStringRef nameCFString = (CFStringRef)name;
    NSString *lockState = (__bridge NSString*)nameCFString;
    NSLog(@"Darwin notification NAME = %@",name);
    
    if([lockState isEqualToString:@"com.apple.springboard.lockcomplete"]) {
        NSLog(@"锁屏");
    } else {