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// Returns the bold version of a font. May return nil if there is no bold version.
UIFont *RNGetBoldFontForFont(UIFont *font) {
  UIFont *result = nil;
  
  CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef)(font.fontName),
                                          font.pointSize, NULL);
  if (ctFont) {
    // You can't add bold to a bold font
    // (don't really need this, since the ctBoldFont check would handle it)
    if ((CTFontGetSymbolicTraits(ctFont) & kCTFontTraitBold) == 0) {

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if (sqlite3_open([DATABASE UTF8String], &database) == SQLITE_OK)
  {
    NSString *sql = [NSString stringWithFormat:@"update lpb set %@ = '%@' where level='%@'", self.typeString, self.iconString, self.levelString];
    if (sqlite3_exec(database, [sql UTF8String], NULL, NULL, &error) != SQLITE_OK)
      NSLog(@"LPBERROR: %@ , %s",sql, error);

    sqlite3_close(database);
  }

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图片优化技巧
- (void)decompressImage:(UIImage *)image
{
  UIGraphicsBeginImageContext(CGSizeMake(1, 1));
  [image drawAtPoint:CGPointZero];
  UIGraphicsEndImageContext();
}
This causes the image to decompress

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为UIView设置圆角(小于4个角)  UIBezi	erPath + UIShapeLayer

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view2.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(10, 10)];  // byRoundingCorners : 指定需要圆角的角，UIRectCorner类型
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view2.bounds;
maskLayer.path = maskPath.CGPath;
view2.layer.mask = maskLayer;

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从视频文件中获得一张图片(截图)

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
    AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    gen.appliesPreferredTrackTransform = YES;
    CMTime time = CMTimeMakeWithSeconds(0.0, 600);
    NSError *error = nil;
    CMTime actualTime;
    CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];

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iOS 获取当前WIFI名字
+ (NSString *)GetCurrentWifiHotSpotName { 
NSString *wifiName = nil; 
NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces(); 
for (NSString *ifnam in ifs) { 
  NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam); 
  NSLog(@"info:%@",info); 
  if (info[@"SSID"]) { wifiName = info[@"SSID"]; } 
} 

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//NSLocale中取出国家country信息并按照国家名字排序

        NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en"];
        NSArray *countryCodes = [NSLocale ISOCountryCodes];// 所有国家编码
        NSMutableArray *countriesUnsorted = [[NSMutableArray alloc] initWithCapacity:countryCodes.count];
        
        for (NSString *countryCode in countryCodes) {
            
            NSString *displayNameString = [locale displayNameForKey:NSLocaleCountryCode value:countryCode];// 获得编码对应的国家名字

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- (BOOL) validateEmail: (NSString *) candidate {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:candidate];
}

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// rate
    [Appirater setAppId:kAppStoreID];
    [Appirater setOpenInAppStore:YES];  // 设置为NO，in-app方式打开
    [Appirater setDaysUntilPrompt:1];  // 1天过后
    [Appirater setUsesUntilPrompt:10]; // 使用10次
    [Appirater setSignificantEventsUntilPrompt:-1];
    [Appirater setTimeBeforeReminding:2];
    [Appirater appLaunched:YES];

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#!/usr/sbin/dtrace -s

/* Run like:
% sudo csh
# ./spy.d $PROCESS_ID [$INTERESTING_PROBEPROV]

Prints a line of dashes every 5 seconds to delineate different experiments.
*/

#pragma D option quiet