How can I perform a run-time 开发者_开发问答check to see if I can use UIGraphicsBeginImageContextWithOptions, which is only available starting with iOS 4.
I\'ve seen code like: 开发者_如何学Cif (delegate != nil && [delegate respondsToSelector:@selector(doSomething)]) ...
天下有我更精彩 2022-03-19 20:44 开发者_如何学编程 根据成语接龙规则，开头为“俩”的成语根本就无法找到，所以这是一个BUG，一个顶俩就是一个无法被领取的接龙红包！a小小白菜
加载中,请稍侯......