objective-c – 单击时更改按钮背景颜色

发布时间：2020-12-14 19:22:41 所属栏目：百科来源：网络整理

导读：我创建了一个按钮,我希望在用户点击时更改其颜色.我看到了选项“setimagebackground … forstate ……”,但没有其他选项可以改变背景颜色.我在viewdidload中更改了y按钮的值,当我使用“settint color：[uicolor redcolor]”时,没有任何反应. 我该怎么解决？

我创建了一个按钮,我希望在用户点击时更改其颜色.我看到了选项“setimagebackground … forstate ……”,但没有其他选项可以改变背景颜色.我在viewdidload中更改了y按钮的值,当我使用“settint color：[uicolor redcolor]”时,没有任何反应.
我该怎么解决？
这是我的代码：

button1.layer.borderColor = [[UIColor purpleColor]CGColor];
    button1.layer.cornerRadius = 8.0f;
    button1.layer.masksToBounds = YES;
    button1.layer.borderWidth = 1.0f; 
    [button1.tintColor = [UIColor redColor]CGColor];
    [button1 setTintColor:[UIColor blueColor]];
    [button1 setTitleColor:[UIColor cyanColor] forState:UIControlStateNormal];
    [button1 setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
    [button1 setTintColor:[UIColor redColor]];

谢谢！

解决方法

有了图片：

[button1 setBackgroundImage:[UIImage imageNamed:@"redButton.png"]];

没有图片：

[button1 setBackgroundColor:[UIColor redColor] ];

有了这个你可以得到圆形边框：

CALayer * layer = [button1 layer];     
     [layer setCornerRadius:8.0f];
     [layer setMasksToBounds:YES];
     [layer setBorderWidth:1.0f];
     [layer setBorderColor:[[UIColor whiteColor] CGColor]];
     button1.backgroundColor = [UIColor redColor];

对于选定的状态子类UIButton,以这种方式：

在.h文件中：

@interface MyButton : UIButton 
{
@private
    NSMutableDictionary *backgroundStates;
@public

}

- (void) setBackgroundColor:(UIColor *) _backgroundColor forState:(UIControlState) _state;
- (UIColor*) backgroundColorForState:(UIControlState) _state;

@end

在.m文件中：

#import "MyButton.h"


@implementation MyButton

- (void) setBackgroundColor:(UIColor *) _backgroundColor forState:(UIControlState) _state {
    if (backgroundStates == nil) 
        backgroundStates = [[NSMutableDictionary alloc] init];

    [backgroundStates setObject:_backgroundColor forKey:[NSNumber numberWithInt:_state]];

    if (self.backgroundColor == nil)
        [self setBackgroundColor:_backgroundColor];
}

- (UIColor*) backgroundColorForState:(UIControlState) _state {
    return [backgroundStates objectForKey:[NSNumber numberWithInt:_state]];
}

#pragma mark -
#pragma mark Touches

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];

    UIColor *selectedColor = [backgroundStates objectForKey:[NSNumber numberWithInt:UIControlStateHighlighted]];
    if (selectedColor) {
        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionFade];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaSEOut]];
        [self.layer addAnimation:animation forKey:@"EaSEOut"];
        self.backgroundColor = selectedColor;
    }
}

- (void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesCancelled:touches withEvent:event];

    UIColor *normalColor = [backgroundStates objectForKey:[NSNumber numberWithInt:UIControlStateNormal]];
    if (normalColor) {
        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionFade];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaSEOut]];
        [self.layer addAnimation:animation forKey:@"EaSEOut"];
        self.backgroundColor = normalColor;
    }
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];

    UIColor *normalColor = [backgroundStates objectForKey:[NSNumber numberWithInt:UIControlStateNormal]];
    if (normalColor) {
        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionFade];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaSEOut]];
        [self.layer addAnimation:animation forKey:@"EaSEOut"];
        self.backgroundColor = normalColor;
    }
}

- (void) dealloc {
    [backgroundStates release];
    [super dealloc];
}

@end

然后在ViewController中(记住要包含您的自定义类),您可以这样设置颜色：

[button1 setBackgroundColor:[UIColor colorWithRed:0.8 green:0.7 blue:0.6 alpha:1.0] forState:UIControlStateHighlighted];

（编辑：李大同）

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