iPhone按钮选定状态

Question

我创建了两个彼此相邻的按钮来模仿分段控件。 我这样做是为了自定义超出 UIKit 允许的外观。 我决定使用选定的属性来按住按钮。 我有两个图像，每个状态正常和选择一个。

问题是，当我选择一个按钮时，由于突出显示状态，该按钮会突出显示并变暗。 我决定也将所选图像用于突出显示状态，但它会闪烁，任何想法或建议。

- (void)leftSegmentPressed:(id)sender
{
    if ([sender isSelected]) {
        [sender setSelected:NO];
    }
    else {
        [sender setSelected:YES];
    }
}

Answer 1

对于"选定"按钮，禁用它并手动切换状态的图像。

- (void) viewDidLoad
{
    [rightSegmentButton setImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
    [rightSegmentButton setImage:[UIImage imageNamed:@"selected.png"] forState:UIControlStateDisabled];
    [leftSegmentButton setImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
    [leftSegmentButton setImage:[UIImage imageNamed:@"selected.png"] forState:UIControlStateDisabled];
}
- (void)leftSegmentPressed:(id)sender
{
    sender.enabled = NO;
    rightSegmentButton.enabled = YES;
}
- (void)rightSegmentPressed:(id)sender
{
    sender.enabled = NO;
    leftSegmentButton.enabled = YES;
}

Answer 2

检查您给出的图像是否在您的Bundle中，或者检查您给出的图像名称是否在lower case中。然后写成

[button1 setImage:[UIImage imageNamed:@"normal1.png"] forState:UIControlStateNormal];
[button1 setImage:[UIImage imageNamed:@"selected1.png"] forState:UIControlStateSelected];
[button2 setImage:[UIImage imageNamed:@"normal2.png"] forState:UIControlStateNormal];
[button2 setImage:[UIImage imageNamed:@"selected2.png"] forState:UIControlStateSelected];
button1.tag = 1;
button2.tag = 2;
[button1 addTarget:self action:@selector(buttonSelected:) forControlEvents:UIControlEventTouchUpInside]
[button2 addTarget:self action:@selector(buttonSelected:) forControlEvents:UIControlEventTouchUpInside]

在按钮事件方法中

-(void)buttonSelected:(id)sender {
    if([sender tag] == 1) {
        button1.selected = YES;
        button2.selected = NO;
    } else {
         button1.selected = NO;
         button2.selected = YES;
    }
}

Answer 3

[button setAdjustsImageWhenHighlighted：NO];

这将防止闪烁。

Answer 4

UIButton *yourButton1 = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
yourButton1.frame = CGRectMake(110.0, 360.0, 100.0, 30.0);
[yourButton1 setTitle:@"Left" forState:UIControlStateNormal];
yourButton.backgroundColor = [UIColor clearColor];
yourButton1.tag = 1;
[yourButton1 setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal ];    
UIImage *buttonImageNormal = [UIImage imageNamed:@"yourNormalImage.png"];// set normal image 
UIImage *strechableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[yourButton1 setBackgroundImage:strechableButtonImageNormal forState:UIControlStateNormal];
UIImage *buttonImagePressed = [UIImage imageNamed:@"yourSelectedImage.png"];// set selected image
UIImage *strechableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[yourButton1 setBackgroundImage:strechableButtonImagePressed forState:UIControlStateHighlighted];
[yourButton1 addTarget:self action:@selector(leftSegmentPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:yourButton1];

对另一个按钮执行相同的操作。

并在操作方法中设置下面的代码。

- (void)leftSegmentPressed:(id)sender
{
    UIButton *btnTemp = (UIBUtton *)sender;
    if (btnTemp.tag == 1) {
        [yourButton1 setSelected:YES];
        [yourButton2 setSelected:NO];
    }
    else {
        [yourButton1 setSelected:NO];
        [yourButton2 setSelected:YES];
    }
}