使用[UIColor colorWithRed:green:blue:alpha:]不能与UITableView seperatorColor一起使用? [英] Using [UIColor colorWithRed:green:blue:alpha:] doesn't work with UITableView seperatorColor?
问题描述
我尝试配置深灰色分隔符颜色。为什么下面什么都不做呢?
self.tableView.seperatorStyle = UITableViewCellSeperatorStyleSingleLine;
self.tableView.seperatorColor = [UIColor colorWithRed:127 green:127 blue:127 alpha:1];
返回一个没有分隔符的表。
只要我使用 [UIColor blackColor] ,那么我就得到了分隔符。
你需要除以 255.0
p>
因为我几乎没有使用1.0和0.0之间的值,我创建了一个非常简单的UIColor类别,它自己执行杂乱的外观:(从http://github.com/Jon889/JPGeneral )
//.h文件
@interface UIColor(JPExtras)
+(UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:
@end
//.m file
@implementation UIColor(JPExtras)
+(UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:(CGFloat)alpha {
return [UIColor colorWithRed:(red / 255.0)green:(green / 255.0)blue:(blue / 255.0)alpha:
}
@end
类别I链接到上面):
[UIColor colorWithR:127 G:127:B:127 A:1];
I'm trying to configure a dark gray seperator color. Why does the following do nothing?
self.tableView.seperatorStyle = UITableViewCellSeperatorStyleSingleLine;
self.tableView.seperatorColor = [UIColor colorWithRed: 127 green:127 blue:127 alpha:1];
returns a table with no seperators at all.
As soon as I use [UIColor blackColor] then I get seperators just fine. What's the deal?
You need to divide by 255.0
Because I hardly ever use values between 1.0 and 0.0, I created a very simple UIColor category that does the messy looking division by itself: (from http://github.com/Jon889/JPGeneral)
//.h file
@interface UIColor (JPExtras)
+ (UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:(CGFloat)alpha;
@end
//.m file
@implementation UIColor (JPExtras)
+ (UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:(CGFloat)alpha {
return [UIColor colorWithRed:(red/255.0) green:(green/255.0) blue:(blue/255.0) alpha:alpha];
}
@end
So you can just do(If you import the category I linked to above):
[UIColor colorWithR:127 G:127: B:127 A:1];
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