(转发)IOS高级开发～Runtime（四）

用C代替OC：

#import <objc/runtime.h>

#import <objc/message.h>

#import <stdio.h>

extern int UIApplicationMain (int argc,char *argv[],void *principalClassName,void *delegateClassName);

struct Rect {

float x;

float y;

float width;

float height;

};

typedef struct Rect Rect;

void *navController;

static int numberOfRows =100;

int tableView_numberOfRowsInSection(void *receiver,structobjc_selector *selector,
void *tblview,int section) {

returnnumberOfRows;

}

void *tableView_cellForRowAtIndexPath(void *receiver,structobjc_selector *selector,
void *tblview,void *indexPath) {

Class TableViewCell = (Class)objc_getClass("UITableViewCell");

void *cell = class_createInstance(TableViewCell,0);

objc_msgSend(cell,
sel_registerName("init"));

char buffer[7];

int row = (int)
objc_msgSend(indexPath, sel_registerName("row"));

sprintf (buffer, "Row %d", row);

void *label =objc_msgSend(objc_getClass("NSString"),sel_registerName("stringWithUTF8String:"),buffer);

objc_msgSend(cell,
sel_registerName("setText:"),label);

return cell;

}

void tableView_didSelectRowAtIndexPath(void *receiver,structobjc_selector *selector,
void *tblview,void *indexPath) {

Class ViewController = (Class)objc_getClass("UIViewController");

void * vc = class_createInstance(ViewController,0);

objc_msgSend(vc,
sel_registerName("init"));

char buffer[8];

int row = (int)
objc_msgSend(indexPath, sel_registerName("row"));

sprintf (buffer, "Item %d", row);

void *label =objc_msgSend(objc_getClass("NSString"),sel_registerName("stringWithUTF8String:"),buffer);

objc_msgSend(vc,
sel_registerName("setTitle:"),label);

objc_msgSend(navController,sel_registerName("pushViewController:animated:"),vc,1);

}

void *createDataSource() {

Class superclass = (Class)objc_getClass("NSObject");

Class DataSource = objc_allocateClassPair(superclass,"DataSource",0);

class_addMethod(DataSource,sel_registerName("tableView:numberOfRowsInSection:"), (void(*))tableView_numberOfRowsInSection,nil);

class_addMethod(DataSource,sel_registerName("tableView:cellForRowAtIndexPath:"), (void(*))tableView_cellForRowAtIndexPath,nil);

objc_registerClassPair(DataSource);

returnclass_createInstance(DataSource,0);

}

void * createDelegate() {

Class superclass = (Class)objc_getClass("NSObject");

Class DataSource = objc_allocateClassPair(superclass,"Delegate",0);

class_addMethod(DataSource,sel_registerName("tableView:didSelectRowAtIndexPath:"), (void(*))tableView_didSelectRowAtIndexPath,nil);

objc_registerClassPair(DataSource);

returnclass_createInstance(DataSource,0);

}

void applicationdidFinishLaunching(void *receiver,structobjc_selector *selector,
void *application) {

Class windowClass = (Class)objc_getClass("UIWindow");

void * windowInstance =
class_createInstance(windowClass, 0);

objc_msgSend(windowInstance,
sel_registerName("initWithFrame:"),(Rect){0,0,320,480});

//Make Key and Visiable

objc_msgSend(windowInstance,sel_registerName("makeKeyAndVisible"));

//Create Table View

Class TableViewController = (Class)objc_getClass("UITableViewController");

void *tableViewController =
class_createInstance(TableViewController, 0);

objc_msgSend(tableViewController,
sel_registerName("init"));

void *tableView = objc_msgSend(tableViewController,sel_registerName("tableView"));

objc_msgSend(tableView,
sel_registerName("setDataSource:"),createDataSource());

objc_msgSend(tableView,
sel_registerName("setDelegate:"),createDelegate());

Class NavController = (Class)objc_getClass("UINavigationController");

navController = class_createInstance(NavController,0);

objc_msgSend(navController,sel_registerName("initWithRootViewController:"),tableViewController);

void *view =objc_msgSend(navController,sel_registerName("view"));

//Add Table View To Window

objc_msgSend(windowInstance,
sel_registerName("addSubview:"),view);

}

//Create an class named "AppDelegate", and return it's name as an instance of class NSString

void *createAppDelegate() {

Class mySubclass =
objc_allocateClassPair((Class)objc_getClass("NSObject"),"AppDelegate",0);

structobjc_selector *selName =sel_registerName("application:didFinishLaunchingWithOptions:");

class_addMethod(mySubclass, selName, (void(*))applicationdidFinishLaunching,nil);

objc_registerClassPair(mySubclass);

returnobjc_msgSend(objc_getClass("NSString"),sel_registerName("stringWithUTF8String:"),"AppDelegate");

}

int main(int argc,
char *argv[]) {

returnUIApplicationMain(argc, argv,0,createAppDelegate());

}

运行效果：

IOS高级开发～Runtime（一）

http://blog.csdn.net/zfpp25_/article/details/9496705

IOS高级开发～Runtime（二）

http://blog.csdn.net/zfpp25_/article/details/9497187

IOS高级开发～Runtime（三）

http://blog.csdn.net/zfpp25_/article/details/9497721

IOS高级开发～Runtime（四）

http://blog.csdn.net/zfpp25_/article/details/9498233