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    NSArray *familyNames = [[NSArray alloc] initWithArray:[UIFont familyNames]];
    NSArray *fontNames;
    NSInteger indFamily, indFont;
    for (indFamily=0; indFamily<[familyNames count]; ++indFamily)
    {
        NSLog(@"Family name: %@", [familyNames objectAtIndex:indFamily]);
        fontNames = [[NSArray alloc] initWithArray:
                     [UIFont fontNamesForFamilyName:
                      [familyNames objectAtIndex:indFamily]]];
        for (indFont=0; indFont<[fontNames count]; ++indFont)

xuyunan

- (CGFloat)heighWithFont:(UIFont *)font constrainedToSize:(CGSize)size
{
    return [self sizeWithFont:font constrainedToSize:size].height;
}

- (CGFloat)widthWithFont:(UIFont *)font constrainedToSize:(CGSize)size
{
    return [self sizeWithFont:font constrainedToSize:size].width;
}

xuyunan

// remove
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:cachePath isDirectory:YES]) {
    connsuccess = [fileManager removeItemAtPath:cachePath error:nil];
}

// size bytes
- (unsigned long long)sizeForPath:(NSString *)path
{
    __block unsigned long long size = 0;

xuyunan

// - (void)viewDidAppear
[[NSNotificationCenter defaultCenter] addObserver:self
                                        selector:@selector(textFieldTextDidChangeNotification:)
                                            name:UITextFieldTextDidChangeNotification
                                          object:nil];

// - (void)viewDidDisappear
[[NSNotificationCenter defaultCenter] removeObserver:self
                                                name:UITextFieldTextDidChangeNotification
                                              object:nil];

xuyunan

// 截全屏
- (UIImage *)imageWithScreenContents
{
    UIGraphicsBeginImageContext(SCREEN_SIZE);
    UIImage *aImage =UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return aImage;
}

xuyunan

+ (int)countWord:(NSString *)s
{
    int i,n=[s length],l=0,a=0,b=0;
    unichar c;
    for(i=0;i<n;i++){
        c=[s characterAtIndex:i];
        if(isblank(c)){
            b++;
        }else if(isascii(c)){
            a++;

xuyunan

+ (NSString *)dirUserData:(NSString *)userid
{
    NSArray *arrayFiles = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docPath = [arrayFiles objectAtIndex:0];
    NSString *userDataDir = [docPath stringByAppendingPathComponent:userid];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDirectory;
    BOOL isExist = [fileManager fileExistsAtPath:userDataDir isDirectory:&isDirectory];
    if (!isExist || (isExist && !isDirectory)) {
        NSError *error;

xuyunan

// Easiest way:
// Prefs.h
#define PREFS_MY_CONSTANT @"prefs_my_constant"

// Better way:
// Prefs.h
extern NSString * const PREFS_MY_CONSTANT;

// Prefs.m
NSString * const PREFS_MY_CONSTANT = @"prefs_my_constant";

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static dispatch_once_t predicate;

+ (id)sharedUser
{
    static id shareUser = nil;
    dispatch_once(&predicate, ^{
        shareUser = [[super allocWithZone:NULL] init];
    });
    return shareUser;
}

xuyunan

// iOS4.0以上
// MessageUI.framework
// #import <MessageUI/MessageUI.h>
// @interface ViewController () <MFMessageComposeViewControllerDelegate>

- (IBAction)sendSMS:(id)sender
{
    MFMessageComposeViewController *controller = [[MFMessageComposeViewController alloc] init];
    if([MFMessageComposeViewController canSendText])
    {