枚举注释2

//枚举类型NS_ENUM()
typedef NS_ENUM(NSInteger, LeftMenuTopItemType) {
    LeftMenuTopItemMain,
    LeftMenuTopItemShows,
    LeftMenuTopItemSchedule
};

for (i=1; i++; i<=7)

for (i=1; i++; i<=NUM_DAYS_IN_WEEK)

@property (weak, nonatomic) IBOutlet UIButton *myBtn;

@property (copy, nonatomic) NSString *name;

switch (condition) {
    case 1:
        // ** fall-through! **
    case 2:
        // code executed for values 1 and 2
        break;
    default:
        //代码
        break;
}

CGRect frame   = self.view.frame;
CGFloat x 	   = CGRectGetMinX(frame);
CGFloat y 	   = CGRectGetMinY(frame);
CGFloat width  = CGRectGetWidth(frame);
CGFloat height = CGRectGetHeight(frame);
CGRect frame   = CGRectMake(0.0, 0.0, width, height);

@interface AirPlane
+ (instancetype)airPlaneWithType:(AirPlaneType)type;
@end

- (instancetype)init {
    self = [super init];
    if (self) {
        //代码
    }
    return self;
}

+ (instancetype)sharedInstance {
    static id sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[self alloc] init];
    });
    return sharedInstance;
}

//普通常量
static const NSTimeInterval ANIMATION_DURATION = 0.3;

//外部常量
extern const NSTimeInterval TYANIMATION_DURATION;

//错误
[dic setObject:obj forKey:@"key"];
//正确
[dic setObject:obj ? obj:@"" forKey:@"key"];

//错误
[array addObject:obj];
//正确
if (obj) {
   [array addObject:obj];
}

//错误
array[index];
//正确
if (array && index < array.count) {
    array[index];
}

//宏定义
#define ANIMATION_DURATION    0.3

platform :ios, ‘8.0’
target "工程名" do 
pod 'AFNetworking', '~> 3.0.4'
pod 'MBProgressHUD', '~> 0.9.2'
pod 'SDWebImage', '~>3.8'
pod 'MJRefresh', '~> 3.0.6'
pod 'MJExtension', '~> 3.0.9'
pod 'SDAutoLayout', '~> 2.1.1'
pod 'SDCycleScrollView', '~> 1.65'
pod 'TYAttributedLabel', '~> 2.6.1'
pod 'HCSStarRatingView', '~> 1.4.5'
pod 'IQKeyboardManager', '~> 4.0.5'
pod 'HMSegmentedControl', '~> 1.5.3'
pod 'TYAlertController', '~> 1.1.8'
pod 'SKTagView', '~> 0.9.2’

end