tempos21ios

#import <objc/message.h>


    SEL method = @selector(sendAsynchronousRequest:queue:completionHandler:);
    if(!(class_getClassMethod([NSURLConnection class],method) != nil))
    {
        return;
    }

  //class_getClassMethod

tempos21ios

@protocol MyClassDelegate <NSObject>
//(...)
@optional
//(...)
@end
 
@interface MyClass : NSObject
@property (nonatomic, weak) id <MyClassDelegate> delegate;
// (...)

tempos21ios

static inline double radians (double degrees) {return degrees * M_PI/180;}

tempos21ios

//Vamos a observar la propiedad cartUnits del objeto _product
[_product addObserver:self forKeyPath:@"cartUnits" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:nil];
 
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if([keyPath isEqualToString:@"cartUnits"])
    {
        //Acción
    }
}

tempos21ios

-(long long int)javaUnixTimeStamp:(NSDate *)fecha
{
    long long int ti =  ( (long long int)[fecha timeIntervalSince1970]);
    ti *= 1000;
    return ti;
    
    
}

tempos21ios

/*
 *  System Versioning Preprocessor Macros
 */ 
 
#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
 

tempos21ios

typedef NS_ENUM(NSUInteger, MyType)
{
    MyType_XXX,
    MyType_YYY,
    MyType_ZZZ
};

tempos21ios

static ClassName* shared = nil;
 
+ (ClassName *)sharedInstance
{
    if(!shared)
    {
        static dispatch_once_t pred;    // Lock
        dispatch_once(&pred, ^{         // This code is called at most once per app
            shared = [[ClassName alloc] init];
        });

tempos21ios

static MyClass *sharedMyManager = nil;
 
+ (MyClass*)sharedInstance
{
    if (sharedMyManager == nil) {
        sharedMyManager = [[super allocWithZone:NULL] init];
    }
    return sharedMyManager;
}