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swift 里面对应C 的基础类型前面加C，CInt、CBool和CChar UnsafePointer<CChar> 对应C的 const char *;常量指针不可变 UnsafeMutablePointer<CChar> 对应C的 char *;可变指针 下面第一行为String 转 char*；第二行为char* 转String let sss = UnsafePointer<CChar>("char string..".cStringUsingEncoding(NSUTF8StringEncoding)) print(String.fromCString(sss))
比如下面使用C语言objc/runtime遍历当前类中所有成员变量，使用了UnsafeMutablePointer<UInt32>，对应C里面 unsigned int *varCount let varCount:UnsafeMutablePointer<UInt32> = UnsafeMutablePointer<UInt32>.alloc(1) varCount.initialize(0) let classVars = class_copyIvarList(self.classForCoder, varCount) for i in 0 ... (Int(varCount.memory)-1){ let c:Ivar = classVars[i] let name = ivar_getName(c) let ncc = UnsafePointer<CChar>( 用OC翻译过来可以这样写 unsigned count = 0; Ivar *vars = class_copyIvarList(c, &count); for (int i = 0; i < count; i++) { Ivar v = vars[i]; const char *name = ivar_getName(v); const char *nameType = ivar_getTypeEncoding(v); NSLog(@"==%s==",name); NSLog(@"==%s==",nameType); NSString *sname = [NSString stringWithCString:name encoding:NSUTF8StringEncoding]; } free(vars);
swift中UnsafePointer<T>可以用.memory取得指针指向的值 let ss: UnsafePointer<CChar> = UnsafePointer<CChar>("b".cStringUsingEncoding(NSUTF8StringEncoding)) NSLog("%c-%d", 67, ss.memory)
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