IOS开发教程--怎样使用点9图片

事先准备一张图片：

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UIImage *image = [UIImage
imageNamed:@"red.png"];

在iOS 5.0之前能够这么用:

NSInteger leftCapWidth = image.size.width *
0.5f;

NSInteger topCapHeight = image.size.height *
0.5f;

image = [image stretchableImageWithLeftCapWidth:leftCapWidth
topCapHeight:topCapHeight];

在iOS 5.0中能够这么用：

CGFloat top = 8;// 顶端盖高度

CGFloat bottom = 8; // 底端盖高度

CGFloat left = 8; // 左端盖宽度

CGFloat right = 8;// 右端盖宽度

UIEdgeInsets insets = UIEdgeInsetsMake(top, left, bottom, right);

// 伸缩后又一次赋值

image = [image resizableImageWithCapInsets:insets];

在iOS6.0中能够这么用：

CGFloat top = 12;
// 顶端盖高度

CGFloat bottom =
12 ; //
底端盖高度

CGFloat left =
10; //
左端盖宽度

CGFloat right =
10; //
右端盖宽度

UIEdgeInsets insets =
UIEdgeInsetsMake(top, left, bottom, right);

// 指定为拉伸模式，伸缩后又一次赋值

image = [image resizableImageWithCapInsets:insets
resizingMode:UIImageResizingModeStretch];