我的按钮框架图像真的有问题， 我想要的是: 1.选中后会打勾 2.当 View 被关闭然后返回到上一个屏幕时，它仍然会选中图像中的支票 3. 当我点击所选图像或其他图像时，它会删除复选标记。
我能够做到，但我在设置图像时遇到问题:
我想要的是:
UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
[myButton setEnabled:NO];
但这是我需要的功能:
UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setImage:bgImage forState:UIControlStateSelected];
[myButton setSelected:YES];
下面是代码(如果我做的有问题请告诉我，谢谢):
- (void)viewDidLoad {
UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
[myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
// Create view
UIScrollView *view = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f,0.0f,1024.0f,768.0f)];
int row = 0;
int column = 0;
for(int i = 0; i < _thumbs.count; ++i) {
UIImage *thumb = [_thumbs objectAtIndex:i];
myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.frame = CGRectMake(column*140+24, row*150+10, 100, 100);
[myButton setImage:thumb forState:UIControlStateNormal];
[myButton addTarget:self
action:@selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
myButton.tag = i;
NSLog(@"%i",i);
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSInteger selectedImageSlot1 = [prefs integerForKey:@"selected1"];
if ( selectedImageSlot1 == i){
[self turnButtonToSelected];
}
[view addSubview:myButton];
if (column == 6) {
column = 0;
row++;
} else {
column++;
}
}
[view setContentSize:CGSizeMake(1024, (row+1) * 150 + 10)];
}
- (void)turnButtonToSelected
{ UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setBackgroundImage:bgImage forState:UIControlStateNormal];
[myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
[myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
[myButton setEnabled:NO];
}
- (void)highlightButton:(UIButton *)a {
//[self turnButtonToSelected];
}
- (IBAction)buttonClicked:(id)sender {
myButton = (UIButton *)sender;
self.selectedImage = [_images objectAtIndex:myButton.tag];
if (myButton.selected) {
[sender setSelected:NO];
}else {
UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[sender setImage:bgImage forState:UIControlStateSelected];
[sender setSelected:YES];
}
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setInteger:myButton.tag forKey:@"slot1"];
[[NSUserDefaults standardUserDefaults] setInteger:myButton.tag forKey:@"selected1"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self performSelector:@selector(highlightButton:) withObject:sender afterDelay:0.0];
[self dismissModalViewControllerAnimated:NO];
}
或者有没有一种方法可以在点击时禁用按钮时强制启用按钮？
最佳答案
我刚刚尝试了一种不同的方法。
对我来说它工作得很好并且达到了你的效果。
如果您需要进一步的解释或整个 Xcode 项目，请告诉我。
- (void)viewDidLoad
{
[super viewDidLoad];
//button 1
UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
imageButton.frame = CGRectMake(30, 50, 100, 80);
UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
[imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
[imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
//button 2
UIButton *imageButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
imageButton2.frame = CGRectMake(180, 50, 100, 80);
UIImage *btnImage2 = [UIImage imageNamed:@"DSC_5355.JPG"];
[imageButton2 setBackgroundImage:btnImage2 forState:UIControlStateNormal];
[imageButton2 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
[self.view addSubview:imageButton];
[self.view addSubview:imageButton2];
}
- (void)buttonClicked:(UIButton*)button
{
//NSLog(@"Button clicked! %@", button);
UIImage *checkmarkImage = [UIImage imageNamed:@"check.png"];
UIImage *empty = nil;
//NSLog(@"Imageview: %d", button.imageView.tag);
if (button.imageView.tag == 0)
{
[button setImage:checkmarkImage forState:UIControlStateNormal];
button.imageView.tag = 1;
}
else
{
[button setImage:empty forState:UIControlStateNormal];
button.imageView.tag = 0;
}
}
最好的，克里斯
更新:我已经更新了代码。这是整个 ViewController。注意:我会使用 coreData 来存储当前索引来解决这个问题。以下代码不是解决此问题的最佳方法，而是基于您的初始代码!
//
// SOViewController.m
// SOImageOverlay
//
// Created by Chris on 24.07.12.
//
#import "SOViewController.h"
@interface SOViewController ()
@end
#define CHECKMARK_IMAGE @"check.png"
@implementation SOViewController
@synthesize buttons = _buttons;
#pragma mark - Custom getter
- (NSMutableArray*)buttons
{
if (_buttons == nil)
_buttons = [[NSMutableArray alloc] init];
return _buttons;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];
// UIButton *myButton =
// [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
// [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
// Create view
// UIScrollView *view = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f,0.0f,1024.0f,768.0f)];
int row = 0;
int column = 0;
for(int i = 0; i < 2; ++i) {
/*UIImage *thumb = [_thumbs objectAtIndex:i];
myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.frame = CGRectMake(column*140+24, row*150+10, 100, 100);
[myButton setImage:thumb forState:UIControlStateNormal];
[myButton addTarget:self
action:@selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
myButton.tag = i;
NSLog(@"%i",i);*/
UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
if (i == 0)
{
UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
imageButton.frame = CGRectMake(30, 50, 100, 80);
[imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
}
else if (i == 1)
{
UIImage *btnImage = [UIImage imageNamed:@"DSC_5355.JPG"];
imageButton.frame = CGRectMake(180, 50, 100, 80);
[imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
}
[imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSInteger selectedImageSlot1 = [prefs integerForKey:@"selected1"];
if ( selectedImageSlot1 == i){
[self turnButtonToSelected:imageButton];
}
[self.view addSubview:imageButton];
//adding current button into buttons array
[self.buttons addObject:imageButton];
if (column == 6) {
column = 0;
row++;
} else {
column++;
}
}
//[view setContentSize:CGSizeMake(1024, (row+1) * 150 + 10)];
// //button 1
// UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
// imageButton.frame = CGRectMake(30, 50, 100, 80);
// UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
// [imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
// [imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
//
// //button 2
// UIButton *imageButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
// imageButton2.frame = CGRectMake(180, 50, 100, 80);
// UIImage *btnImage2 = [UIImage imageNamed:@"DSC_5355.JPG"];
// [imageButton2 setBackgroundImage:btnImage2 forState:UIControlStateNormal];
// [imageButton2 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
//
// [self.view addSubview:imageButton];
// [self.view addSubview:imageButton2];
}
//- (void)buttonClicked:(UIButton*)button
//{
// //NSLog(@"Button clicked! %@", button);
//
// UIImage *checkmarkImage = [UIImage imageNamed:@"check.png"];
// UIImage *empty = nil;
//
// //NSLog(@"Imageview: %d", button.imageView.tag);
// if (button.imageView.tag == 0)
// {
// [button setImage:checkmarkImage forState:UIControlStateNormal];
// button.imageView.tag = 1;
// }
// else
// {
// [button setImage:empty forState:UIControlStateNormal];
// button.imageView.tag = 0;
// }
//}
// code from stackoverflow
// ------------------------------------------------------------
- (void)turnButtonToSelected:(UIButton*)button
{
UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];
//UIButton *myButton = button; //just to use the copied code
button.selected = YES;
[button setImage:bgImage forState:UIControlStateSelected];
// [myButton setBackgroundImage:bgImage forState:UIControlStateNormal];
// [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
// [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
// [myButton setEnabled:NO];
}
- (void)highlightButton:(UIButton *)a {
//[self turnButtonToSelected];
}
- (IBAction)buttonClicked:(id)sender
{
UIButton *myButton = (UIButton *)sender;
//I have removed this line... due to the fact that I don't want to
//implement your arrays.
//self.selectedImage = [_images objectAtIndex:myButton.tag];
//deselecting all
for (UIButton *button in self.buttons)
{
button.selected = NO;
//[button setImage:nil forState:UIControlStateNormal];
}
if (myButton.selected) {
[sender setSelected:NO];
}else {
UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];
[sender setImage:bgImage forState:UIControlStateSelected];
[sender setSelected:YES];
}
// NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// [prefs setInteger:myButton.tag forKey:@"slot1"];
//getting index of button in array
NSInteger index = 0;
NSInteger foundIndex = -1;
for (UIButton *button in self.buttons)
{
if (button == myButton)
{
foundIndex = index;
}
index++;
}
if (foundIndex >= 0)
{
[[NSUserDefaults standardUserDefaults] setInteger:foundIndex forKey:@"selected1"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
[self performSelector:@selector(highlightButton:) withObject:sender afterDelay:0.0];
// [self dismissModalViewControllerAnimated:NO];
}
// ------------------------------------------------------------
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (IBAction)closeButtonClicked:(UIBarButtonItem *)sender
{
[self dismissModalViewControllerAnimated:YES];
}
@end
关于iphone - 以编程方式更改按钮状态，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11431255/
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