typedef struct {

CGFloat x;
CGFloat y;

} MyPoint;

// 返回CGPoint结构体的属性 @property (nonatomic, readonly) CGPoint center;

// 自定义方法返回NSRange - (NSRange)findSubstringRange:(NSString *)text {

NSRange range = [text rangeOfString:@"Swift"];
return range; // 直接返回结构体实例

}

typedef struct { int x, y; } Coordinate;

void modifyCoordinate(Coordinate coord) {

coord.x = 100; // 只修改副本

}

Coordinate origin = {10, 20}; modifyCoordinate(origin); NSLog(@"原始值: %d", origin.x); // 输出 10

typedef struct {

Coordinate position;  // 第三章定义的Coordinate结构体
CGSize dimensions;

} GameObject;

• (GameObject)createPlayer { Coordinate start = {0,0}; return (GameObject){start, {50,50}}; // 直接返回嵌套结构体 }

(lldb) type lookup MyCustomStruct