ethanbing

if ([[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length]<=0) {
}

ethanbing

NSString* keysPressed = [theEvent characters];
    if ( [keysPressed isEqualToString:@" "] )
    {
        if(theEvent.type==NSKeyDown)
            NSLog(@"spaceDown");
        if(theEvent.type==NSKeyUp)
            NSLog(@"spaceUp");
}

ethanbing

BOOL bo = [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
        bo ? : NSLog(@"创建失败");

ethanbing

/**
 Returns the path to the application's documents directory.
 */
- (NSString *)applicationDocumentsDirectory {
     
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
    return basePath;
}

ethanbing

+ (AppDelegate *)sharedAppDelegate {
	return (AppDelegate *)[[UIApplication sharedApplication] delegate];
}

ethanbing

AFHTTPRequestOperation * operation = [_AFManager POST:[_baseURL stringByAppendingString:MCSetavatarInterface] parameters:dic constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileURL:[dic objectForKey:@"url"] name:@"avatar" error:nil];
        
    } success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    }];

ethanbing

	1、 三角函数 
　　double sin (double);正弦 
　　double cos (double);余弦 
　　double tan (double);正切 
　　2 、反三角函数 
　　double asin (double); 结果介于[-PI/2, PI/2] 
　　double acos (double); 结果介于[0, PI] 
　　double atan (double); 反正切(主值), 结果介于[-PI/2, PI/2] 
　　double atan2 (double, double); 反正切(整圆值), 结果介于[-PI, PI] 
　　3 、双曲三角函数 

ethanbing

//绘制三角
- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextBeginPath(context);
    CGContextMoveToPoint   (context, CGRectGetMinX(rect), CGRectGetMaxY(rect));
    CGContextAddLineToPoint(context, CGRectGetMidX(rect), CGRectGetMinY(rect));
    CGContextAddLineToPoint(context, CGRectGetMaxX(rect), CGRectGetMaxY(rect));
    CGContextClosePath(context);

ethanbing

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

ethanbing

NSDate *date = [NSDate date];
        // 调整8小时时差
        NSTimeZone *zone = [NSTimeZone systemTimeZone];
        NSInteger interval = [zone secondsFromGMTForDate:date];
        NSDate *localeDate = [date  dateByAddingTimeInterval: interval];