我们一般切换UIViewController的时候用的是例如以下代码

#import "UIViewControllerDemo.h"UIViewControllerDemo *vc = [UIViewControllerDemo alloc] initWithNibName:nil bundle:nil] autorelease];[self.navigationController pushViewController:vc animated:YES];

当我们须要切换的UIViewController多的时候呢,代码难免写成:

#import "UIViewControllerDemo1.h" #import "UIViewControllerDemo2.h" #import "UIViewControllerDemo3.h" #import "UIViewControllerDemo4.h" UIViewControllerDemo1 *vc1 UIViewControllerDemo2 *vc2 UIViewControllerDemo3 *vc3 UIViewControllerDemo4 *vc4

以后维护的时候非常是麻烦

以下我们将对UIViewController切换的方法进行改造

-(void) pushVC:(NSString *)vcName{
         Class class = NSClassFromString(vcName);    NSAssert(class != nil, @"Class 必须存在");    UIViewController *vc = [[[NSClassFromString(vcName) alloc] init] autorelease];    [self.navigationController pushViewController:vc animated:YES];}

这里能够增加一个协议,使用我们指定的方法来初始化,这样能够在初始话的同一时候带入參数

@protocol XYSwitchControllerProtocol 
      
       -(id) initWithObject:(id)object;@end-(void) pushVC:(NSString *)vcName object:(id)object{
         Class class = NSClassFromString(vcName);    NSAssert(class != nil, @"Class 必须存在");    UIViewController *vc = nil;    if ([class conformsToProtocol:@protocol(XYSwitchControllerProtocol)]) {
             vc = [[[NSClassFromString(vcName) alloc] initWithObject:object] autorelease];    }else {
             vc = [[[NSClassFromString(vcName) alloc] init] autorelease];        vc.parameters = object;    }    [self.navigationController pushViewController:vc animated:YES];}
      

模态的方法则多个考虑个UINavigationController

-(void) modalVC:(NSString *)vcName withNavigationVC:(NSString *)nvcName object:(id)object succeed:(UIViewController_block_void)block{
         Class class = NSClassFromString(vcName);    NSAssert(class != nil, @"Class 必须存在");    UIViewController *vc = nil;    if ([class conformsToProtocol:@protocol(XYSwitchControllerProtocol)]) {
             vc = [[[NSClassFromString(vcName) alloc] initWithObject:object] autorelease];    }else {
             vc = [[[NSClassFromString(vcName) alloc] init] autorelease];        vc.parameters = object;    }    UINavigationController *nvc = nil;    if (nvcName) {
             nvc = [[[NSClassFromString(vcName) alloc] initWithRootViewController:vc] autorelease];        [self presentViewController:nvc animated:YES completion:block];        return;    }    [self presentViewController:vc animated:YES completion:block];}