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- (NSString *)contentTypeForImageData:(NSData *)data {
    uint8_t c;
    [data getBytes:&c length:1];
    
    switch (c) {
        case 0xFF:
            return @"image/jpeg";
        case 0x89:
            return @"image/png";
        case 0x47:

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UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image = [[UIImage imageNamed:@"image_name"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[button setImage:image forState:UIControlStateNormal]; 
button.tintColor = [UIColor yourColor];

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systemLayoutSizeFittingSize:

boundingRectWithSize:options:attributes:context:

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- (UIImage *)imageFromView:(UIView *)view {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:NO];
    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return img;
}

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- (UIImage *)imageRotatedByDegrees:(UIImage*)oldImage deg:(CGFloat)degrees{
  //Calculate the size of the rotated view's containing box for our drawing space
  UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,oldImage.size.width, oldImage.size.height)];
  CGAffineTransform t = CGAffineTransformMakeRotation(degrees * M_PI / 180);
  rotatedViewBox.transform = t;
  CGSize rotatedSize = rotatedViewBox.frame.size;

  //Create the bitmap context
  UIGraphicsBeginImageContext(rotatedSize);
  CGContextRef bitmap = UIGraphicsGetCurrentContext();

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-(void)startPlaybackForItemWithURL:(NSURL*)url {

    // First create an AVPlayerItem
    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithURL:url];

    // Subscribe to the AVPlayerItem's DidPlayToEndTime notification.
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(itemDidFinishPlaying:) name:AVPlayerItemDidPlayToEndTimeNotification object:playerItem];

    // Pass the AVPlayerItem to a new player
    AVPlayer* player = [[[AVPlayer alloc] initWithPlayerItem:playerItem] autorelease];

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/*
iOS7中UIViewController新增的属性extendedLayoutIncludesOpaqueBars和edgesForExtendedLayout可以解决该问题。
其中这个属性指定了当Bar使用了不透明图片时，视图是否延伸至Bar所在区域，默认值时NO。
而edgesForExtendedLayout则是表示视图是否覆盖到四周的区域，默认是UIRectEdgeAll，即上下左右四个方向都会覆盖，
那么为让顶部不进行延伸到导航栏覆盖的区域，我们可以把顶部区域延伸去掉。
*/


self.extendedLayoutIncludesOpaqueBars = NO;

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#!/bin/sh

if ! ([ -f "$1" ]); then
echo \"${1}\"文件不存在
exit
fi
ipaName=${1%.ipa}
if [ "$ipaName" = "$1" ]; then
echo \"${1}\"不是ipa文件
exit

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- (UIImage*) imageWithUIView:(UIView*) view{
    // 创建一个bitmap的context  
    // 并把它设置成为当前正在使用的context  
    UIGraphicsBeginImageContext(view.bounds.size);  
    CGContextRef currnetContext = UIGraphicsGetCurrentContext();
    //[view.layer drawInContext:currnetContext];
    [view.layer renderInContext:currnetContext];
    // 从当前context中创建一个改变大小后的图片  
    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();  
    // 使当前的context出堆栈  

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UIView *view = [UIView alloc]init];

view.userInteractionEnabled = NO;