iOS常用代码收集

1.调用safari打开url

NSURL* url = [[NSURL alloc] initWithString:@"http://www.olnnlo.com"];  
[[ UIApplication sharedApplication]openURL:url]; 

2.发起电话呼叫

NSURL* url = [[NSURL alloc] initWithString:@"tel:110"];  
[[ UIApplication sharedApplication]openURL:url];