// 添加监听者
[selfaddObserver:selfforKeyPath:property options:NSKeyValueObservingOptionNew context:nil];
// 当监听的属性值变化的时候会来到这个方法
- (void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void*)context {
if([keyPathisEqualToString:@"property"]) {
[selftextViewTextChange];
}else{
}
}
