嗨，我有一个问题，
我可以在showImage方法中成功获取“imageName”变量中的UrL字符串存储。
我需要在此方法中执行相同的操作“segmentedControlIndexChanged”，但我无法获取变量“imageName”。
无论如何我可以声明IBAction方法与showImage方法类似吗？
我试过 - ＆gt;“-(IBAction) segmentedControlIndexChanged:(NSString *)imageName{}”但它无法工作，我无法获取变量“imageName”。
- (void) showImage:(NSString *)imageName
{
NSData *imageData;
//NSString * string1 = [NSString stringWithFormat:imageName];
imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imageName]];
//NSLog(@"%@",imageName);
image = [[UIImage alloc] initWithData:imageData];
self.imageView.image = image;
[imageView setFrame:CGRectMake(5, 10, image.size.width, image.size.height)];
[scrollview setScrollEnabled:YES];
if(image.size.height+20 >= 224)
{
[scrollview setContentSize:CGSizeMake(289, image.size.height + 20)];
}
else {
[scrollview setContentSize:CGSizeMake(289, 224)];
}
}
////////
-(IBAction) segmentedControlIndexChanged{
switch (self.segmentedControl.selectedSegmentIndex) {
case 0:
image = [UIImage imageNamed:image1name];
self.imageView.image = image;
[imageView setFrame:CGRectMake(5, 10, image.size.width, image.size.height)];
[scrollview setScrollEnabled:YES];
if(image.size.height+20 >= 224)
{
[scrollview setContentSize:CGSizeMake(289, image.size.height + 20)];
}
else {
[scrollview setContentSize:CGSizeMake(289, 224)];
}
break;
case 1:
image = [UIImage imageNamed:image2name];
self.imageView.image = image;
[imageView setFrame:CGRectMake(5, 10, image.size.width, image.size.height)];
[scrollview setScrollEnabled:YES];
[scrollview setContentSize:CGSizeMake(289, image.size.height+20)];
break;
case 2:
image = [UIImage imageNamed:image3name];
self.imageView.image = image;
[imageView setFrame:CGRectMake(5, 10, image.size.width, image.size.height+1)];
[scrollview setScrollEnabled:YES];
[scrollview setContentSize:CGSizeMake(289, image.size.height+20)];
break;
default:
break;
}
}
修改
我遇到Bad Access错误，有人知道这是什么意思，或者有人能告诉我一些解决方法吗？
答案 0 :(得分：1)
不，IBAction在iOS中只能拥有以下三种签名之一：
- (void)action
- (void)action:(id)sender
- (void)action:(id)sender forEvent:(UIEvent *)event
修改
您可以扩展UIButton以存储您需要的值，例如：
@interface MyButton : UIButton {
}
@property (nonatomic, retain) NSString *url;
@end
...
@implementation MyButton
@synthesize url;
@end
...
- (void)buttonTapped:(id)sender {
MyButton *button = (MyButton *)sender;
UIImage *image = [UIImage imageNamed:button.url];
...
}
修改
您可以使用标签来区分不同的发件人，例如
enum {
ButtonOneTag = 128,
ButtonTwoTag,
...
}
...
- (void)buttonTapped:(id)sender {
UIButton *button = (UIButton *)sender;
switch(button.tag) {
case ButtonOneTag:
NSLog(@"Button One Tapped");
break;
case ButtonTwoTag:
NSLog(@"Button Two Tapped");
break;
}
您还可以将发件人与ivars进行比较，如下所示：
- (void)buttonTapped:(id)sender {
//assuming buttonOne and buttonTwo are IBOutlets on this class
if (sender == self.buttonOne) {
NSLog(@"Button One Tapped");
else if (sender == self.buttonTwo) {
NSLog(@"Button Two Tapped");
}
...
}