ios-改变图片的尺寸

//改变图片的尺寸

-(UIImage*) OriginImage:(UIImage *)image scaleToSize:(CGSize)size

{

UIGraphicsBeginImageContext(size);  //size 为CGSize类型，即你所需要的图片尺寸

[image drawInRect:CGRectMake(0, 0, size.width, size.height)];

UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImage *imagescaless=  [self imageRetain:scaledImage];

return imagescaless;   //返回的就是已经改变的图片

}

//对.2x图片进行处理

-(UIImage*)imageRetain:(UIImage *)sourceImage

{

CGSize size;

size = CGSizeMake(sourceImage.size.width / 2.0f, sourceImage.size.height / 2.0f);

UIGraphicsBeginImageContextWithOptions(size, NO, 0);

if (1.0 == [[UIScreen mainScreen] scale]){

[sourceImage drawInRect:CGRectIntegral((CGRect){0.0f, 0.0f, size})];

}else{

[sourceImage drawInRect:(CGRect){0.0f, 0.0f, size}];

sourceImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

}

return sourceImage;

}

下面是调用方法：

- (void)viewDidLoad

{

[super viewDidLoad];

_dataList=[[NSMutableArray alloc]initWithCapacity:10];

[self initViews];

NSArray *tmpArray1 = @[@"照片墙",@"讨论区",@"群组",@"通讯录"];

self.SXHAry = tmpArray1;

NSArray *tmpArray2 = @[@"晚报放心购",@"厦门房产动态",@"厦门车市动态"];

self.XMRBAry = tmpArray2;

NSArray *bFirsts = @[@"gc1.png",@"gc2.png",@"gc3.png",@"gc4.png"];

NSMutableArray *bFirst=[[NSMutableArray alloc]initWithCapacity:0];

for (int i=0; i<bFirsts.count; i++) {

UIImage*images=[UIImage imageNamed:[bFirsts objectAtIndex:i]];

UIImage *imagenew=[self OriginImage:images scaleToSize:CGSizeMake(45, 45)];

[bFirst addObject:imagenew];

}

self.bFirstAry = [bFirst copy];

NSArray *bSecconds = @[@"gc6.png",@"gc7.png",@"gc8.png"];

NSMutableArray *bSecond=[[NSMutableArray alloc]initWithCapacity:0];

for (int i=0; i<bSecconds.count; i++) {

UIImage*images=[UIImage imageNamed:[bSecconds objectAtIndex:i]];

UIImage *imagenew=[self OriginImage:images scaleToSize:CGSizeMake(45, 45)];

[bSecond addObject:imagenew];

}

self.bSecondAry = [bSecond copy];

NSArray *rFirsts = @[@"gc1.png",@"gc2.png",@"gc3.png",@"gc4.png"];

NSMutableArray *rFirst=[[NSMutableArray alloc]initWithCapacity:0];

for (int i=0; i<rFirsts.count; i++) {

UIImage*images=[UIImage imageNamed:[rFirsts objectAtIndex:i]];

UIImage *imagenew=[self OriginImage:images scaleToSize:CGSizeMake(45, 45)];

[rFirst addObject:imagenew];

}

self.rFirstAry = [rFirst copy];

NSArray *rSeconds = @[@"gc6.png",@"gc7.png",@"gc8.png"];

NSMutableArray *rSecond=[[NSMutableArray alloc]initWithCapacity:0];

for (int i=0; i<rSeconds.count; i++) {

UIImage*images=[UIImage imageNamed:[rSeconds objectAtIndex:i]];

UIImage *imagenew=[self OriginImage:images scaleToSize:CGSizeMake(45, 45)];

[rSecond addObject:imagenew];

}

self.rSecondtAry = [rSecond copy];

[self setExtraCellLineHidden:self.squareTableCell];

}