UIButton 设置不触发点击事件javascript:void(null)

self.subBtn.userInteractionEnabled = NO;设置点击无响应
self.subBtn.alpha = 0.4;//背景置灰色

//如果网址中存在中文，进行URLEncode.
//// NSString *newUrlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//UITextFile
http://blog.csdn.net/u011334685/article/details/46470579