iOS开发－NSString

来源：互联网发布：问道1.52服务端源码编辑：程序博客网时间：2024/05/16 04:05

NSString转换int

8.UIVIEW层次控制

置顶：[superview bringSubviewToFront:subview]；

置底：[superview sendSubviewToBack:subview]；

10.字符串是否含有某字符串

[str rangOfString:@"abc"].length > 0

12.移除UIView上所有的subViews
除了遍历移除subView 还可以用这个方法：
[[self.view subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)];

14.判断是否retina屏幕

#define isRetina ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)

15.withObject:传入整型参数

[self performSelector:@selector(frontButtonScaleUp) withObject:[NSNumber numberWithInt:[sender tag]] afterDelay:delay - elapsed];

[self performSelector:@selector(frontButtonScaleUp) withObject:(id)[sender tag] afterDelay:delay - elapsed];

16.清除UIwebview产的的缓存
有时以页面形式加载，当页面更新时，再次访问也是缓存，怎么清空呢？[[NSURLCache sharedURLCache] removeAllCachedResponses];

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