【发布时间】：2021-09-29 18:12:22
【问题描述】：
我有一个UICollectionView，其中选择了单元格时，它们会改为由用户选择的颜色。绘制全图：颜色由用户从带有点击手势的色轮 (UIImageView) 中选择。
也就是说，当用户在选择 3 个单元格并将它们设为绿色后点击一种新颜色，比如紫色（并重置定义的 rString、bString 和 gString...），我想重新加载他们正在使用的颜色而不从集合视图中擦除最初的 3 个选定的绿色单元格。我怎样才能做到这一点？
参见下面的代码。
ViewController.m
@interface ViewController () {
CGPoint lastPoint;
NSInteger rString;
NSInteger bString;
NSInteger gString;
UIColor *colour;
}
@property (strong, nonatomic, nullable) NSIndexPath *trackingCellIndexPath;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.ringCollectionView.allowsMultipleSelection = YES;
UITapGestureRecognizer * tapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(tapGesture:)];
[self.colorWheel addGestureRecognizer:tapRecognizer];
self.colorWheel.userInteractionEnabled = YES;
}
- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"RingCollectionViewCell" forIndexPath:indexPath];
if (!cell.selectedBackgroundView) {
cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.bounds];
cell.selectedBackgroundView.backgroundColor = [UIColor grayColor];
} else {
cell.selectedBackgroundView = [[UIView alloc] initWithFrame:cell.bounds];
cell.selectedBackgroundView.backgroundColor = [UIColor colorWithRed:rString/255.0 green:gString/255.0 blue:bString/255.0 alpha:1.0];
}
if ((indexPath.row >=9 && indexPath.row <=14) || ((indexPath.row >=17 && indexPath.row < 23) || (indexPath.row >=25 && indexPath.row <=30) || (indexPath.row >=33 && indexPath.row <=38))) {
NSLog(@"NOT AVAILABLE SORRY");
cell.backgroundColor = [UIColor whiteColor];
[cell setUserInteractionEnabled:NO];
}
return cell;
}
-(void)tapGesture:(UITapGestureRecognizer *)recognizer {
CGPoint location = [recognizer locationInView:recognizer.view];
CGPoint p = { round(location.x), round(location.y) };
_colorView.backgroundColor = [self colorInViewAtPoint:p];
UIColor *mylovelycolor = [self colorInViewAtPoint:p];
const CGFloat *components = CGColorGetComponents(mylovelycolor.CGColor);
NSLog(@"Red: %f", components[0]);
NSLog(@"Green: %f", components[1]);
NSLog(@"Blue: %f", components[2]);
NSLog(@"Alpha: %f", CGColorGetAlpha(mylovelycolor.CGColor));
int red = components[0] * 255;
int green = components[1] * 255;
int blue = components[2] * 255;
NSString *red1 = [@(red) stringValue];
NSString *green1 = [@(green) stringValue];
NSString *blue1 = [@(blue) stringValue];
NSInteger redInt = [red1 integerValue];
NSInteger greenInt = [green1 integerValue];
NSInteger blueInt = [blue1 integerValue];
rString = [red1 integerValue];
bString = [blue1 integerValue];
gString = [green1 integerValue];
self.redValue.text = red1;
self.greenValue.text = green1;
self.blueValue.text = blue1;
NSMutableString *str1 = [NSMutableString string];
for(NSInteger numberCopy = redInt; numberCopy > 0; numberCopy >>= 1)
{
[str1 insertString:((numberCopy & 1) ? @"1" : @"0") atIndex:0];
}
NSMutableString *str2 = [NSMutableString string];
for(NSInteger numberCopy = greenInt; numberCopy > 0; numberCopy >>= 1)
{
[str2 insertString:((numberCopy & 1) ? @"1" : @"0") atIndex:0];
}
NSMutableString *str3 = [NSMutableString string];
for(NSInteger numberCopy = blueInt; numberCopy > 0; numberCopy >>= 1)
{
[str3 insertString:((numberCopy & 1) ? @"1" : @"0") atIndex:0];
}
self.binaryString = [NSString stringWithFormat:@" %@ %@ %@", str1, str2, str3];
}
【问题讨论】：
标签： ios objective-c uicollectionview