• 修改UISearchBar背景


    转载:http://blog.csdn.net/favormm/archive/2010/11/30/6045463.aspx

    UISearchBar是由两个subView组成的,一个是UISearchBarBackGround,另一个是UITextField. 而IB中没有直接操作背景的属性,在此我总结了几个方法去修改它。

    1. 只显示UITextField.采用了layer mask.代码如下:

    1. //first make sure you include core animation so that the compiler will know about your view's layer  
    2. #import <QuartzCore/QuartzCore.h>  
    3. //now make a mask.  this is basically just a solid colored shape.  When you apply the mask, anywhere where the color is solid will become transparent in your view.  i used the excellent Opacity (http://likethought.com/opacity/) to generate this code, but you can do it any way you'd like  
    4. @interface SearchMaskLayer : CALayer {  
    5. }  
    6. @end  
    7. @implementation SearchMaskLayer  
    8. - (void)drawInContext:(CGContextRef)context  
    9. {  
    10.   
    11.     CGRect imageBounds = CGRectMake(0, 0, 310, 34);  
    12.     CGRect bounds = imageBounds;  
    13.     CGFloat alignStroke;  
    14.     CGFloat resolution;  
    15.     CGMutablePathRef path;  
    16.     CGPoint point;  
    17.     CGPoint controlPoint1;  
    18.     CGPoint controlPoint2;  
    19.     UIColor *color;  
    20.     resolution = 0.5 * (bounds.size.width / imageBounds.size.width + bounds.size.height / imageBounds.size.height);  
    21.     CGContextSaveGState(context);  
    22.     CGContextTranslateCTM(context, bounds.origin.x, bounds.origin.y);  
    23.     CGContextScaleCTM(context, (bounds.size.width / imageBounds.size.width), (bounds.size.height / imageBounds.size.height));  
    24.     // Layer 1  
    25.     alignStroke = 0.0;  
    26.     path = CGPathCreateMutable();  
    27.     point = CGPointMake(295.0, 32.0);  
    28.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    29.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    30.     CGPathMoveToPoint(path, NULL, point.x, point.y);  
    31.     point = CGPointMake(310.0, 17.0);  
    32.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    33.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    34.     controlPoint1 = CGPointMake(303.229, 32.0);  
    35.     controlPoint1.x = (round(resolution * controlPoint1.x + alignStroke) - alignStroke) / resolution;  
    36.     controlPoint1.y = (round(resolution * controlPoint1.y + alignStroke) - alignStroke) / resolution;  
    37.     controlPoint2 = CGPointMake(310.0, 25.229);  
    38.     controlPoint2.x = (round(resolution * controlPoint2.x + alignStroke) - alignStroke) / resolution;  
    39.     controlPoint2.y = (round(resolution * controlPoint2.y + alignStroke) - alignStroke) / resolution;  
    40.     CGPathAddCurveToPoint(path, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, point.x, point.y);  
    41.     point = CGPointMake(310.0, 17.0);  
    42.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    43.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    44.     CGPathAddLineToPoint(path, NULL, point.x, point.y);  
    45.     point = CGPointMake(295.0, 2.0);  
    46.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    47.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    48.     controlPoint1 = CGPointMake(310.0, 8.771);  
    49.     controlPoint1.x = (round(resolution * controlPoint1.x + alignStroke) - alignStroke) / resolution;  
    50.     controlPoint1.y = (round(resolution * controlPoint1.y + alignStroke) - alignStroke) / resolution;  
    51.     controlPoint2 = CGPointMake(303.229, 2.0);  
    52.     controlPoint2.x = (round(resolution * controlPoint2.x + alignStroke) - alignStroke) / resolution;  
    53.     controlPoint2.y = (round(resolution * controlPoint2.y + alignStroke) - alignStroke) / resolution;  
    54.     CGPathAddCurveToPoint(path, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, point.x, point.y);  
    55.     point = CGPointMake(15.0, 2.0);  
    56.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    57.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    58.     CGPathAddLineToPoint(path, NULL, point.x, point.y);  
    59.     point = CGPointMake(0.0, 17.0);  
    60.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    61.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    62.     controlPoint1 = CGPointMake(6.771, 2.0);  
    63.     controlPoint1.x = (round(resolution * controlPoint1.x + alignStroke) - alignStroke) / resolution;  
    64.     controlPoint1.y = (round(resolution * controlPoint1.y + alignStroke) - alignStroke) / resolution;  
    65.     controlPoint2 = CGPointMake(0.0, 8.771);  
    66.     controlPoint2.x = (round(resolution * controlPoint2.x + alignStroke) - alignStroke) / resolution;  
    67.     controlPoint2.y = (round(resolution * controlPoint2.y + alignStroke) - alignStroke) / resolution;  
    68.     CGPathAddCurveToPoint(path, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, point.x, point.y);  
    69.     point = CGPointMake(0.0, 17.0);  
    70.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    71.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    72.     CGPathAddLineToPoint(path, NULL, point.x, point.y);  
    73.     point = CGPointMake(15.0, 32.0);  
    74.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    75.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    76.     controlPoint1 = CGPointMake(0.0, 25.229);  
    77.     controlPoint1.x = (round(resolution * controlPoint1.x + alignStroke) - alignStroke) / resolution;  
    78.     controlPoint1.y = (round(resolution * controlPoint1.y + alignStroke) - alignStroke) / resolution;  
    79.     controlPoint2 = CGPointMake(6.771, 32.0);  
    80.     controlPoint2.x = (round(resolution * controlPoint2.x + alignStroke) - alignStroke) / resolution;  
    81.     controlPoint2.y = (round(resolution * controlPoint2.y + alignStroke) - alignStroke) / resolution;  
    82.     CGPathAddCurveToPoint(path, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, point.x, point.y);  
    83.     point = CGPointMake(295.0, 32.0);  
    84.     point.x = (round(resolution * point.x + alignStroke) - alignStroke) / resolution;  
    85.     point.y = (round(resolution * point.y + alignStroke) - alignStroke) / resolution;  
    86.     CGPathAddLineToPoint(path, NULL, point.x, point.y);  
    87.     CGPathCloseSubpath(path);  
    88.     color = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];  
    89.     [color setFill];  
    90.     CGContextAddPath(context, path);  
    91.     CGContextFillPath(context);  
    92.     CGPathRelease(path);  
    93. }  
    94. 然后在你的controller中应用这个mask layer到你的UISearchBar  
    95. - (void)viewDidLoad {  
    96.     [super viewDidLoad];  
    97.     SearchMaskLayer *maskLayer = [[SearchMaskLayer alloc] init];  
    98.     [maskLayer setFrame:CGRectMake(0, 0, 310, 34)];  
    99.     [maskLayer setPosition:CGPointMake(162,21)];  
    100.     [maskLayer setNeedsDisplay];      
    101.     [self.searchBar.layer setNeedsDisplay];  
    102.     [self.searchBar.layer setMask:maskLayer];  
    103.     [maskLayer release];  
    104. }  
     

    2. 隐藏背景。非官方的方法。

    1. for (UIView *subview in searchBar.subviews) {  
    2.     if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {  
    3.         [subview removeFromSuperview];  
    4.         break;  
    5.     }  
    6. }  
     

    3. 改变UISearchBar外观。 你可以子类化或category UISearchBar,然后实现两个方法,见代码。

    1. - (void)drawRect:(CGRect)rect {  
    2. //  UIImage *image = [UIImage imageNamed: @"background.png"];  
    3. //  [image drawInRect:rect];  
    4. }  
    5. - (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {       
    6.     UIImage *img = [UIImage imageNamed: @"background.png"];       
    7.     UIImageView *v = [[[UIImageView alloc] initWithFrame:CGRectZero] autorelease];       
    8.     [v setImage:img];   
    9.     v.bounds = CGRectMake(0, 0, img.size.width, img.size.height);  
    10.     NSLog([NSString stringWithFormat:@"%f:%f",img.size.width, img.size.height]);  
    11.     NSArray *subs = self.subviews;       
    12.     for (int i = 0; i < [subs count]; i++) {           
    13.         id subv = [self.subviews objectAtIndex:i];           
    14.         if ([subv isKindOfClass:NSClassFromString(@"UISearchBarBackground")])   
    15.         {               
    16.             CGRect viewRect = [subv frame];               
    17.             [v setFrame:viewRect];               
    18.             [self insertSubview:v atIndex:i];           
    19.         }       
    20.     }   
    21.     [v setNeedsDisplay];       
    22.     [v setNeedsLayout];   
    23. }  
     

    UISearchBar也是一个UIView,所以你可以像对待UIView一样对待它。


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  • 原文地址:https://www.cnblogs.com/zsw-1993/p/4880003.html
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