iOS开发 实时监听UITextField内容的变化

给textField添加

[YourTextField addTarget:self action:@selector(textFieldEditingChanged:) forControlEvents:UIControlEventEditingChanged];

只要改变输入框里字体, 就会调用下边的方法

- (void)textFieldEditingChanged :(UITextField *)textField{  
    NSLog( @"text changed: %@", textField.text);  
}