Question

我使用分段控件而不是按钮。如何设置所选段的背景颜色。我试图改变背景颜色，但它的颜色出现在所有片段中。

Answer 1

首先，创建您选择和取消选择的颜色;

UIColor *selectedColor = [UIColor blackColor];
UIColor *deselectedColor = [UIColor whiteColor];

然后，找到所选的段索引并给它颜色;

for (UIControl *subview in [YourSegmentedControl subviews]) {
    if ([subview isSelected]) 
       [subview setTintColor:selectedColor]; 
    else
       [subview setTintColor:deselectedColor]; 
}

Answer 2

如果您选择了第一个索引，请编写此代码。

mutliprocessing

如果设置背景颜色，请编写此代码

 # encoding=utf-8
import datetime
import multiprocessing
import psycopg2

def exe(cmd):
    conn = psycopg2.connect("dbname = test user = pj password = dbrgdbrg")
    cur = conn.cursor()
    try:
        sql = "SELECT id FROM test WHERE ST_MAKEENVELOPE(118,38,119,39,4326) && wkb_geometry;"
        cur.execute(sql)
        print cur.fetchone()
    except Exception, e:
        print e

if __name__ == "__main__":
    cmds=range(5)
    for cmd in  cmds:
        p = multiprocessing.Process(target=exe,args=(cmd,))
        p.start()
        p.join()

如果更改色调颜色和字体大小，请编写此代码。

UPDATE table_a
     SET sequence_column = (select rn 
                             from (
                                select rowid, 
                                      row_number() over (order by col1, col2) AS RN
                                from table_a
                            ) x
                            where x.rowid = table_a.rowid)

Answer 3

我为你的问题尝试了一个示例。我在XIB中设置了段控件。我还设置了三个title.I将段连接到具有属性和操作的ViewController.h。

ViewController.h

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
{
}
@property (strong, nonatomic) IBOutlet UISegmentedControl *segmentBgColorChange;
- (IBAction)actionChangeBGColor:(id)sender;
@end

ViewController.m

#import "ViewController.h"
@interface ViewController ()
{
}
@end
@implementation ViewController
@synthesize segmentBgColorChange;

// Then in action methods

- (IBAction)actionChangeBGColor:(id)sender
{
  UISegmentedControl *seg = sender;
  for (int i=0; i<[seg.subviews count]; i++) {
    if ([[seg.subviews objectAtIndex:i]isSelected]) {
        UIColor *bgColor = [UIColor redColor];
        [[seg.subviews objectAtIndex:i] setTintColor:bgColor];
    } else {
        [[seg.subviews objectAtIndex:i] setTintColor:nil];
    }
   }
 }

如何为ios中选定状态的分段控制中的段设置颜色

3 个答案: