Objective-C和Swift的转换速查手册（推荐）

向数组中添加一个值类型

//Objective-C
NSMutableArray *array = [NSMutableArray new];
//
[array addObject:[NSValue valueWithRect:CGRectMake(0, 0, 32, 64)]];
//在添加到集合前，值类型有对应的引用类型

//Swift
var array = [CGRect]()
//
array.append(CGRect(x: 0, y: 0, width: 32, height: 64))

创建一个字典

//Objective-C
NSDictionary *houseNumbers = @{ @"Paul": @7, @"Jess": @56, @"Peter": @332 };

//Swift
let houseNumbers = ["Paul": 7, "Jess": 56, "Peter": 332]

定义一个枚举

//Objective-C
typedef NS_ENUM(NSInteger, ShapeType) {
 kCircle,
 kRectangle,
 kHexagon
};

//Swift
enum ShapeType: Int {
 case circle
 case rectangle
 case hexagon
}

附加一串字符

//Objective-C
NSString *first = @"Hello, ";
NSString *second = [first stringByAppendingString:@" world!"];

//Swift
let first = "Hello, "
let second = first + "world!"

增加数字

//Objective-C
NSInteger rating = 4;
rating++;
rating += 3;

//Swift
var rating = 4
rating += 1
rating += 3

插入字符串

//Objective-C
NSString *account = @"twostraws";
NSString *str = [NSString stringWithFormat:@"Follow me on Twitter: %@", account];

//Swift
let account = "twostraws"
let str = "Follow me on Twitter: (account)"

打印调试信息

//Objective-C
NSString *username = @"twostraws";
NSLog(@"Username is %@", username);								 
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