Modern Objective c

Use 'Modern Objective-C Syntax'

Objective-C makes heavy use of the @ operator, which generally denotes Objective-C objects. For example, "string" is a char*, while @"string" is an NSString. These have been standard in Objective-C for a long time, but only recently, in Objective-C 2.0, did Apple add in definitions for NSDictionary, NSArray, and NSNumber, all using literals specified with @ directives.

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NSNumber *number = [NSNumber numberWithInteger:7];

NSNumber *modernNumber = @(7); // or @7

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NSArray *array = [NSArray arrayWithObjects:number, modernNumber, nil];

NSArray *modernArray = @[number, modernNumber];

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NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:number, @"number"];

NSDictionary *modernDictionary = @{@"number" : number};

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It's more concise, and still somehow more readable.

Enum 

Replace your enum declarations, such as this one:

enum {

UITableViewCellStyleDefault,

UITableViewCellStyleValue1,

UITableViewCellStyleValue2,

UITableViewCellStyleSubtitle

};

typedef NSInteger UITableViewCellStyle;

with the NS_ENUM syntax:

typedef NS_ENUM(NSInteger, UITableViewCellStyle) {

UITableViewCellStyleDefault,

UITableViewCellStyleValue1,

UITableViewCellStyleValue2,

UITableViewCellStyleSubtitle

};

But when you use enum to define a bitmask, such as here:

enum {

UIViewAutoresizingNone                 = 0,

UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,

UIViewAutoresizingFlexibleWidth        = 1 << 1,

UIViewAutoresizingFlexibleRightMargin  = 1 << 2,

UIViewAutoresizingFlexibleTopMargin    = 1 << 3,

UIViewAutoresizingFlexibleHeight       = 1 << 4,

UIViewAutoresizingFlexibleBottomMargin = 1 << 5

};

typedef NSUInteger UIViewAutoresizing;

use the NS_OPTIONS macro.

typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {

UIViewAutoresizingNone                 = 0,

UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,

UIViewAutoresizingFlexibleWidth        = 1 << 1,

UIViewAutoresizingFlexibleRightMargin  = 1 << 2,

UIViewAutoresizingFlexibleTopMargin    = 1 << 3,

UIViewAutoresizingFlexibleHeight       = 1 << 4,

UIViewAutoresizingFlexibleBottomMargin = 1 << 5

};

Alternatively, you can use the modern Objective-C converter in Xcode to make this change to your code automatically.