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#define IS_IPHONE_5 ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )

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//H

@interface UITextField(UITextFieldCategory) {

}
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)textRectForBounds:(CGRect)bounds;
@end

//M

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- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    UITextPosition *beginning = [textField beginningOfDocument];
    [textField setSelectedTextRange:[textField textRangeFromPosition:beginning
                                                          toPosition:beginning]];
}

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XCTFail (format…)
XCTAssertNil (a1, format…)
XCTAssertNotNil (a1, format…)
XCTAssert (a1, format…)
XCTAssertTrue (a1, format…)
XCTAssertFalse (a1, format…)
XCTAssertEqualObjects (a1, a2, format…)
XCTAssertEquals (a1, a2, format…)
XCTAssertEqualsWithAccuracy (a1, a2, accuracy, format…)
XCTAssertThrows (expression, format…)

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typedef enum {
    UIKeyboardTypeDefault,                // Default type for the current input method.
    UIKeyboardTypeASCIICapable,           // Displays a keyboard which can enter ASCII characters, non-ASCII keyboards remain active
    UIKeyboardTypeNumbersAndPunctuation,  // Numbers and assorted punctuation.
    UIKeyboardTypeURL,                    // A type optimized for URL entry (shows . / .com prominently).
    UIKeyboardTypeNumberPad,              // A number pad (0-9). Suitable for PIN entry.
    UIKeyboardTypePhonePad,               // A phone pad (1-9, *, 0, #, with letters under the numbers).
    UIKeyboardTypeNamePhonePad,           // A type optimized for entering a person's name or phone number.
    UIKeyboardTypeEmailAddress,           // A type optimized for multiple email address entry (shows space @ . prominently).

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static NSString *cellIdentifier = @"SomeCell";
    
    QRScanCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
       if (!cell)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"SomeCellNib"
                                                     owner:self
                                                   options:nil];
        cell = [nib lastObject];
    }

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//Remove seperator insets on iOS7

[self.tableView setSeparatorInset:UIEdgeInsetsZero];

//Set a custom cell seperator

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
...

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//Setup
NSTimer *aTimer = [NSTimer scheduledTimerWithTimeInterval:0.1f
                                                   target:self
                                                 selector:@selector(someSelector)
                                                 userInfo:nil
                                                  repeats:YES];
                                                  
//Tear down
[aTimer invalidate];
aTimer = nil;

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-(UIView*)paddingViewWithImage:(UIImageView*)imageView andPadding:(float)padding
{
    float height = CGRectGetHeight(imageView.frame);
    float width =  CGRectGetWidth(imageView.frame) + padding;
    
    UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
    
    [paddingView addSubview:imageView];
    
    return paddingView;

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//http://www.tutorialspoint.com/cprogramming/c_preprocessors.htm

#define	  Substitutes a preprocessor macro
#include	Inserts a particular header from another file
#undef	  Undefines a preprocessor macro
#ifdef	  Returns true if this macro is defined
#ifndef	  Returns true if this macro is not defined
#if	      Tests if a compile time condition is true
#else	    The alternative for #if
#elif	    #else an #if in one statement