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/*
   先在项目中加好默认的设置，读取的时候如果没有就把默认的写入。
*/

#define FILE_NAME @"CONFIG"
#define FILE_TYPE @"plist"

// eg: cName shanghai
+ (void)setDefultCity:(NSString *)cName
{

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    Class itemClass = [MKMapItem class];
    if (itemClass && [itemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) {
        // iOS 6 MKMapItem available
        MKPlacemark* place = [[MKPlacemark alloc] initWithCoordinate:CLLocationCoordinate2DMake(lat, lng) addressDictionary:nil];
        MKMapItem* destination = [[MKMapItem alloc] initWithPlacemark:place];
        destination.name = addrName;
        NSArray *items = @[destination];
        NSDictionary* options = @{ MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving};
        [MKMapItem openMapsWithItems:items launchOptions:options];
    } else {

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// 产生随机数种子
srandom((unsigned)time(NULL));

- (CGPoint)randomPoint
{
    CGPoint result;
    NSRect r = [self bounds];
    result.x = r.origin.x + random()%(int)r.size.width;
    result.y = r.origin.y + random()%(int)r.size.height;
    return result;

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cd到相应目录,在终端中输入下面两个命令,输出结果相加
find ./ -name "*.m" -exec cat {} \; |wc -l
find ./ -name "*.h" -exec cat {} \; | wc -l 

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#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

// from http://stackoverflow.com/questions/1560081/how-can-i-create-a-uicolor-from-a-hex-string

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    NSMutableDictionary *titleBarAttributes = [NSMutableDictionary dictionaryWithDictionary: [[UINavigationBar appearance] titleTextAttributes]];
    [titleBarAttributes setValue:navBarTitleColor forKey:UITextAttributeTextColor];
    [titleBarAttributes setValue:[NSValue valueWithUIOffset:UIOffsetMake(0.f, 0.f)] forKey:UITextAttributeTextShadowOffset];
    [[UINavigationBar appearance] setTitleTextAttributes:titleBarAttributes];
    [[UINavigationBar appearance] setBackgroundColor:[UIColor clearColor]];
    [[UINavigationBar appearance] setTintColor:kNAVIGATIONBAR_BARBUTTON_COLOR];
    
    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                [UIColor blackColor],
                                UITextAttributeTextColor,

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// 从上往下落的动作 (MKMapViewDelegate method)
- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
    CGRect visibleRect = [mapView annotationVisibleRect];
    for (MKAnnotationView *view in views) {
        CGRect endFrame = view.frame;
        CGRect startFrame = endFrame;
        startFrame.origin.y = visibleRect.origin.y - startFrame.size.height;
        view.frame = startFrame;
        [UIView beginAnimations:@"drop" context:NULL];

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// 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])
    {

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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;
}

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// 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";