Question

我只想设置按钮图像切换到我的IBAction中的不同图像：

if ([sender isSelected]) {
//1
    UIImage *unselectedImage = [[UIImage alloc]initWithContentsOfFile:@"icon_checkbox_up"];
    [sender setImage:unselectedImage forState:UIControlStateSelected];
    [sender setSelected:NO];
}
else {
//2
    UIImage *unselectedImage = [[UIImage alloc]initWithContentsOfFile:@"icon_checkbox_down"];
    [sender setImage:unselectedImage forState:UIControlStateNormal];
    [sender setSelected:YES];
}

当我点击按钮时，图像会相应改变（在注释2下），再次按下按钮后，图像就会消失。我不知道为什么会这样。我已经尝试了UIControlStateSelected和UIControlStateNormal。我错过了什么吗？

Answer 1

如果您的文件名没有错，您可以尝试这种方式。希望它有所帮助!!

[buttn addTarget:self action:@selector(Selected) forControlEvents:UIControlEventTouchDown];
[buttn addTarget:self action:@selector(Unselected) forControlEvents:UIControlEventTouchUpInside];
[buttn addTarget:self action:@selector(Unselected) forControlEvents:UIControlEventTouchUpOutside];

-(void)Selected
{
    UIImage *unselectedImage = [[UIImage alloc]initWithContentsOfFile:@"icon_checkbox_up"];
    [buttn setImage:unselectedImage forState:UIControlStateSelected];
    [buttn setSelected:NO];
}

-(void)Unselected
{
    UIImage *unselectedImage = [[UIImage alloc]initWithContentsOfFile:@"icon_checkbox_down"];
    [buttn setImage:unselectedImage forState:UIControlStateNormal];
    [buttn setSelected:YES];
}

Answer 2

将代码更改为：

if ([sender isSelected]) {
    [sender setSelected:NO];
}
else {
    [sender setSelected:YES];
}

并为每个UIControlState设置XIB文件中的图像。

选择和取消选择时设置按钮图像

2 个答案: