iOS app跳转 微信，支付宝

iOS app跳转支付宝

NSString *str = @"alipay://支付宝key";

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];

iOS app跳转微信

NSString *str = @"weixin://微信key";

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];