Objective-c coding style

# Objective-c coding style

#### 1. 统一使用US英语
<p style='color:#0c0'>符合规则的：</p>
	UIColor *myColor = [UIColor whiteColor];  
<p style='color:#c00'>不符合规则的：</p>
	UIColor *myColour = [UIColor whiteColor];  
	UIColor *yanse = [UIColor whiteColor];
#### 2. 使用#pragma mark - 对方法进行分类
<p style='color:#0c0'>符合规则的：</p>
	#pragma mark - Lifecycle
	
	- (instancetype)init {}  
	
	- (void)dealloc {}  

	- (void)viewDidLoad {}
  
	- (void)viewWillAppear:(BOOL)animated {}  

	- (void)didReceiveMemoryWarning {} 
	 
	#pragma mark - Custom Accessors  
	
	- (void)setCustomProperty:(id)value {}  
	
	- (id)customProperty {}  
	
	#pragma mark - IBActions  
	
	- (IBAction)submitData:(id)sender {}  
	
	#pragma mark - Public  
	
	- (void)publicMethod {}  
	
	#pragma mark - Private  
	
	- (void)privateMethod {}  
	
	#pragma mark - Protocol conformance  
	
	#pragma mark - UITextFieldDelegate  
	
	#pragma mark - UITableViewDataSource  
	
	#pragma mark - UITableViewDelegate  
	
	#pragma mark - NSCopying  
	
	- (id)copyWithZone:(NSZone *)zone {}  
	
	#pragma mark - NSObject  
	
	- (NSString *)description {}
#### 3. 在.h文件中方法以及#pragma mark -间不空行，@property间不空行，但两部分之间空一行
<p style='color:#0c0'>符合规则的：</p>
	@property NSString (nonatomic) *name;
	@property NSInteger length;

	#pragma mark - Lifecycle
	- (instancetype)init {}  
	- (void)dealloc {}  
	- (void)viewDidLoad {}
	- (void)viewWillAppear:(BOOL)animated {}  
	- (void)didReceiveMemoryWarning {}   
<p style='color:#c00'>不符合规则的：</p>
	@property NSString (nonatomic) *name;
	
	@property NSInteger length;

	#pragma mark - Lifecycle
	
	- (instancetype)init {}
	
	- (void)dealloc {}  
	
	- (void)viewDidLoad {}

	- (void)viewWillAppear:(BOOL)animated {}
	  
	- (void)didReceiveMemoryWarning {} 
#### 4. 在.m文件中方法以及#pragma mark -间空一行
<p style='color:#0c0'>符合规则的：</p>
	#pragma mark - Lifecycle
	
	- (instancetype)init {}  
	
	- (void)dealloc {}  

	- (void)viewDidLoad {}
  
	- (void)viewWillAppear:(BOOL)animated {}  

	- (void)didReceiveMemoryWarning {}   
<p style='color:#c00'>不符合规则的：</p>
	#pragma mark - Lifecycle
	- (instancetype)init {}  
	- (void)dealloc {}  
	- (void)viewDidLoad {}
	- (void)viewWillAppear:(BOOL)animated {}  
	- (void)didReceiveMemoryWarning {}
#### 5. @property的默认属性值不写，只注明非默认值
<p style='color:#0c0'>符合规则的：</p>
	@property (weak, nonatomic) NSString *property1;
	@property (nonatomic) NSString *property2;
	@property NSString *property3;
<p style='color:#c00'>不符合规则的：</p>
	@property (strong, atomic) NSString *property1;
#### 6. 选择，循环结构语句块与上一条语句之间空一行
<p style='color:#0c0'>符合规则的：</p>
	NSInteger a;
	NSInteger b;
	
	if (a > b) {
	   NSLog(@"a > b");
	}
<p style='color:#c00'>不符合规则的：</p>
	NSInteger a;
	NSInteger b;
	if (a > b) {
	   NSLog(@"a > b");
	}
#### 7. 缩进使用4个空格，可在Xcode->Preferences->Text Editing中设置
#### 8. 方法及其他语句块的大括号总是在同一行语句打开但在新行中关闭
<p style='color:#0c0'>符合规则的：</p>
	if (success) {  
	    //Do something  
	} else {  
	    //Do something else  
	}
<p style='color:#c00'>不符合规则的：</p>
	if (success)
	{  
	    //Do something  
	} else 
	{  
	    //Do something else  
	}
#### 9. 选择，循环结构语句块中关键字，条件，大括号之间都有一个空格
<p style='color:#0c0'>符合规则的：</p>
	if (success) {  
	    //Do something  
	} else {  
	    //Do something else  
	}
<p style='color:#c00'>不符合规则的：</p>
	if(success){  
	    //Do something  
	}else{  
	    //Do something else  
	}