UI学习之常用方法

1.-(BOOL) respondsToSelector: selector 用来判断是否有以某个名字命名的方法(被封装在一个selector的对象里传递)

1 if ([delegate respondsToSelector:@selector(didFinishUpload:)]) {
2 　　[delegate didFinishUpload:self];
3 }

2.self.window .rootViewController = loginVC;给window添加根视图控制器。

3.   recruitmentViewController *recruitment = [[recruitmentViewController alloc] init];

     [UIApplication sharedApplication].delegate.window.rootViewController = recruitment;在非

#import "AppDelegate.h"中给window添加根视图控制器。

UI学习之常用方法

原文：http://www.cnblogs.com/liuguan/p/4948983.html