Question

在我的xcode中，我有一个动态的uiview

UIView *gaping=[[UIView alloc] initWithFrame:CGRectMake(15, 0, 172, 39)];
    gaping.backgroundColor= [UIColor redColor];

我需要动态改变背景颜色。

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UIView *gaping=[[UIView alloc] initWithFrame:CGRectMake(15, 0, 172, 39)];
    gaping.backgroundColor= [UIColor redColor];


    UITableViewCell *TableCell = [[UITableViewCell alloc] init];
    NSMutableDictionary *RRTYRT = [DATAARRAY objectAtIndex:indexPath.row];

    UILabel *LabelOne = [[UILabel alloc] initWithFrame:CGRectMake(45, 0, 100, 30)];
    LabelOne.textColor = [UIColor whiteColor];
    LabelOne.backgroundColor = [UIColor clearColor];
    LabelOne.text = [RRTYRT objectForKey:@"themename"];
    [gaping addSubview:LabelOne];

    [gaping.layer setCornerRadius:5.8f];

    [TableCell.contentView addSubview:gaping];
    return TableCell;

}

下面提到的代码是我有这个视图的表视图，对于tableview的每个单元格，我需要更改这个UiView的颜色。我知道它有点令人困惑，所以如果有人能帮助我，那将是可以理解的。

由于

Answer 1

尝试使用这样的颜色，使你想要的颜色：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UIView *gaping=[[UIView alloc] initWithFrame:CGRectMake(15, 0, 172, 39)];

    CGFloat redLevel    = rand() / (float) RAND_MAX;
    CGFloat greenLevel  = rand() / (float) RAND_MAX;
    CGFloat blueLevel   = rand() / (float) RAND_MAX;

    gaping.backgroundColor = [UIColor colorWithRed: redLevel
                                                green: greenLevel
                                                 blue: blueLevel
                                                alpha: 1.0];


    UITableViewCell *TableCell = [[UITableViewCell alloc] init];
    NSMutableDictionary *RRTYRT = [DATAARRAY objectAtIndex:indexPath.row];

    UILabel *LabelOne = [[UILabel alloc] initWithFrame:CGRectMake(45, 0, 100, 30)];
    LabelOne.textColor = [UIColor whiteColor];
    LabelOne.backgroundColor = [UIColor clearColor];
    LabelOne.text = [RRTYRT objectForKey:@"themename"];
    [gaping addSubview:LabelOne];

    [gaping.layer setCornerRadius:5.8f];

    [TableCell.contentView addSubview:gaping];
    return TableCell;

}

Answer 2

UIColor *color;
float randomRed = arc4random() % 255;
float randomGreen = arc4random() % 255;
float randomBlue = arc4random() % 255;

 gaping.backgroundColor= [UIColor colorWithRed:randomRed green:randomGreen blue:randomBlue alpha:1.0];

Answer 3

以下是来自Tapku library

的随机颜色

- (UIColor*) randomColor{
    int r = arc4random() % 255;
    int g = arc4random() % 255;
    int b = arc4random() % 255;
    return [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1];
}

And to use it:
LabelOne.backgroundColor = [self randomColor];

但你应该考虑阅读一些关于在objective-c中开发的文章，以及UITableView在重用单元格中的正确用法

Answer 4

这是获得类似于清除应用效果的随机背景颜色的好方法：

-(UIColor*)bcgColorForIndexPath:(NSIndexPath*) indexPath
{
    NSUInteger rowCount = [YOURARRAY count] - 1; //it's your array which gives you all rows for data source
    float value = ((float)indexPath.row / (float)rowCount) * 0.5; // You can change this value depends on your needs
    return [UIColor colorWithRed: 1.0 green:value blue: 0.0 alpha:1.0]; // You can make different color dynamic, for example red, it's deepends on your requirements
}

你这样称呼它：

gaping.backgroundColor = [self bcgColorForIndexPath:indexPath];

Answer 5

试试这个

int lowerBound = 1;
int upperBound = 255;
int red = lowerBound + arc4random() % (upperBound - lowerBound);
int green = lowerBound + arc4random() % (upperBound - lowerBound);
int blue = lowerBound + arc4random() % (upperBound - lowerBound);
[gaping setBackgroundColor:[UIColor colorWithRed:red green:green blue:blue alpha:1.0]];

Answer 6

将忽略对cellForRowAtIndexPath中单元格的背景颜色的任何更改。而是改变单元格颜色：

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    cell.backgroundColor = [self bcgColorForIndexPath:indexPath];
}

...使用Greg的bcgColorForIndexPath方法。

Answer 7

只需将一些UIColor实例化为一系列颜色：

NSMutableArray *myColors = [[NSMutableArray alloc] initWithObjects:[UIColor redColor], [UIColor blackColor], [UIColor pinkColor], [UIColor yellowColor] , nil];

然后将UIView backgroundColor设置如下：

gaping.backgroundColor= [myColors objectAtIndex:indexPath.row];

如果它解决了你的目的，请告诉我。请随意进一步询问。

uiview的随机颜色

7 个答案: