我正在考虑将 UILabel 属性作为 subview 添加到 UIButton 中，以匹配当前存在的 titleLabel 属性的功能，并且给它所有不同的按钮状态(UIControlStateNormal、UIControlStateHighlighted 等)。

我开始尝试将状态存储在 NSDictionary 中，使用状态(包装在 NSNumber 中)作为字典的键，值为文本，文本颜色和阴影颜色。但我不确定这是否会根据各种不同的按钮状态组合正常工作。

到目前为止，我有以下方法:

-(void)setSelected:(BOOL)selected
{
    super.selected = selected;

    [self stateUpdated];
}

-(void)setHighlighted:(BOOL)highlighted
{
    super.highlighted = highlighted;

    [self stateUpdated];
}

-(void)setEnabled:(BOOL)enabled
{
    super.enabled = enabled;

    [self stateUpdated];
}

-(void)stateUpdated
{
    [self updateValueLabel];
}

-(void)setValueText:(NSString *)text forState:(UIControlState)state
{
    NSMutableDictionary *stateValues = self.customStates[@state];

    // If we haven't set the state before create a new place to store them
    if (!stateValues) {
        stateValue = [NSMutableDictionary dictionary];
        self.customStates[@state] = stateValues;
    }

    if (text) {
        stateValues[@"text"] = text;
    } else {
        [stateValues removeObjectForKey:@"text"];
    }

    [self updateValueLabel];
}

-(void)setValueTextColor:(UIColor *)textColor forState:(UIControlState)state
{
    NSMutableDictionary *stateValues = self.customStates[@state];

    // If we haven't set the state before create a new place to store them
    if (!stateValues) {
        stateValues = [NSMutableDictionary dictionary];
        self.customStates[@state] = stateValues;
    }

    if (text) {
        stateValues[@"textColor"] = textColor;
    } else {
        [stateValues removeObjectForKey:@"textColor"];
    }

    [self updateValueLabel];
}

-(void)updateValueLabel
{
    NSMutableDictionary *currentStateValues = self.customStates[@self.state];

    // Set the new values from the current state
    self.valueLabel.text = currentStateValues[@"text"];
    self.valueLabel.textColor = currentStateValues[@"textColor"];
}

我将 valueLabel 作为 UIButton 子类的属性。

为不同状态设置的不同属性似乎没有生效。如果我使用不同的位掩码手动设置它们，那很好，但我想模拟默认回退状态，就像 UIButton 对其属性所做的那样。

因此不必手动设置每一个:

[button setValueText:@"Normal" forState:UIControlStateNormal];
[button setValueText:@"Normal" forState:UIControlStateHighighted];

我希望能够只设置一次标题:

[button setValueText:@"Normal" forState:UIControlStateNormal];

它显示所有州。

提前致谢!

最佳答案

创建一个 getter valueTextForState:，就像 Apple 对 titleForState: 所做的那样.该方法返回值的文档如下:

The title for the specified state. If no title has been set for the specific state, this method returns the title associated with the UIControlStateNormal state.

那么，让我们为您的属性(property)也这样做:

- (NSString *)valueTextForState:(UIControlState)state
{
    NSString *result;
    NSDictionary *currentStateValues;

    currentStateValues = self.customStates[@(state)];
    result = currentStateValues[@"text"];

    if (!result && state != UIControlStateNormal) {
        // Fall back to normal state.
        currentStateValues = self.customStates[@(UIControlStateNormal)];
        result = currentStateValues[@"text"];
    }

    return result;
}

你会为你的颜色做同样的事情。那么您的 updateValueLabel 将如下所示:

-(void)updateValueLabel
{
    // Set the new values from the current state
    self.valueLabel.text = [self valueTextForState:self.state];
    self.valueLabel.textColor = [self valueColorForState:self.state];
}

关于ios - UIButton 如何存储不同的 UI 状态，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21864588/