iOS 代码规范格式 Objective-C（下）

class CrossPlatformAPI {
public:
    ...
    int DoSomethingPlatformSpecific();  // 每个平台的实现都不一样
private:
    int an_instance_var_;
};

#include "cross_platform_header.h"
// 典型的Objective-C class, 使用Objective-C命名规范。
@interface MyDelegate : NSObject {
   @private
       int _instanceVar;
       CrossPlatformAPI *_backEndObject;
}
- (void)respondToSomething:(id)something;
@end
@implementation MyDelegate
- (void)respondToSomething:(id)something {
    // 从Cocoa桥接到C++的后端
    _instanceVar = _backEndObject->DoSomethingPlatformSpecific();
    NSString *tempString = [NSString stringWithFormat:@"%d", _instanceVar];
    NSLog(@"%@", tempString);
}
@end
// C++ class平台相关的实现, 使用C++命名规范
int CrossPlatformAPI::DoSomethingPlatformSpecific() {
    NSString *temp_string = [NSString stringWithFormat:@"%d", an_instance_var_];
    NSLog(@"%@", temp_string);
    return [temp_string intValue];
}

@interface NSString (GTMStringParsingAdditions)
- (NSString *)foobarString:
@end
//使方法和属性私有化
@interface FoobarViewController ()
@property(nonatomic, retain) NSView *dongleView;
- (void)performLayout;
@end

- (id)getDelegate;  // 应避免的
- (id)delegate;    // 推荐的

// 推荐的
- (void)sendAction:(SEL)aSelector toObject:(id)anObject forAllCells:(BOOL)flag; 
// 错误的
- (void)sendAction:(SEL)aSelector :(id)anObject :(BOOL)flag;

// 推荐的
- (id)viewWithTag:(NSInteger)aTag;
// 错误的
- (id)taggedView:(int)aTag;

// 原有方法
- (id)initWithFrame:(CGRect)frameRect; 
// 新方法
- (id)initWithFrame:(NSRect)frameRect mode:(int)aMode cellClass:(Class)factoryId numberOfRows:(int)rowsHigh numberOfColumns:(int)colsWide;

// 推荐的
- (int)runModalForDirectory:(NSString *)path file:(NSString *) name types:(NSArray *)fileTypes;        
//错误的
- (int)runModalForDirectory:(NSString *)path andFile:(NSString *)name andTypes:(NSArray *)fileTypes;

int w;
int nerr;
int nCompConns;
tix = [[NSMutableArray alloc] init];
obj = [someObject object];
p = [network port];

int numErrors;
int numCompletedConnections;
tickets = [[NSMutableArray alloc] init];
userInfo = [someObject object];
port = [network port];

const int kNumberOfFiles = 12;
NSString *const kUserKey = @"kUserKey";
enum DisPlayTinge {
    DisplayTingeGreen = 1
    DisplayTingeBlue = 2
};

/// <#Description#>
/// @param nibNameOrNil <#nibNameOrNil description#>
/// @param nibBundleOrNil <#nibBundleOrNil description#>
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;
@property (copy) NSString *host; // network host

// GTMFoo.m
#import "GTMFoo.h"
@interface GTMFoo (PrivateDelegateHandling)
- (NSString *)doSomethingWithDelegate;  // Declare private method
@end
@implementation GTMFoo(PrivateDelegateHandling)
...
- (NSString *)doSomethingWithDelegate {
    // Implement this method
}
...
@end

@interface GTMFoo () { ... }

#import <Foundation/Foundation.h> // 推荐
#import <Foundation/NSArray.h> // 避免
#import <Foundation/NSString.h> // 避免
...

- (instancetype)init {
     self = [super init];
     if (self) {
        _bar = [[NSMutableString alloc] init];  // 推荐
     }
     return self;
}
- (void)dealloc {
    [_bar release];                           // 推荐
    [super dealloc];
}
- (instancetype)init {
    self = [super init];
    if (self) {
       self.bar = [NSMutableString string];  // 避免
    }
    return self;
}
- (void)dealloc {
    self.bar = nil;                         // 避免
    [super dealloc];
}

- (void)setFoo:(NSString *)aFoo {
   [_foo autorelease];
   _foo = [aFoo copy];
}

- (BOOL)isBold {
    return [self fontTraits] & NSFontBoldTrait;
}
- (BOOL)isValid {
    return [self stringValue];
}
- (BOOL)isBold {
    return ([self fontTraits] & NSFontBoldTrait) ? YES : NO;
}
- (BOOL)isValid {
    return [self stringValue] != nil;
}
- (BOOL)isEnabled {
    return [self isValid] && [self isBold];
}

BOOL great = [foo isGreat];
if (great == YES) {
     // ...
}

BOOL great = [foo isGreat];
if (great) {
     // ...be great!
}

@interface MyClass : NSObject
@property(copy, nonatomic) NSString *name;
@end
@implementation MyClass
// No code required for auto-synthesis, else use:
// @synthesize name = _name;
@end

@interface MyClass : NSObject {
    @private
       NSString *_name;
}
@property(copy, nonatomic) NSString *name;
@end
@implementation MyClass
@synthesize name = _name;
- (instancetype)init {
    ...
}
@end

@interface MyClass : NSObject
// Does a lot of stuff
- (void)fooBarBam;
@end
@interface MyClass : NSObject {
}
// Does a lot of stuff
- (void)fooBarBam;
@end

// Header file
@protocol Thingy
@property(nonatomic, copy) NSString *widgetName;
@end
@interface Foo : NSObject<Thingy>
// A guy walks into a bar.
@property(nonatomic, copy) NSString *bar;
@end
// Implementation file
@interface Foo ()
@property(nonatomic, retain) NSArray *baz;
@end
@implementation Foo
@synthesize widgetName = _widgetName;
@end