croath

有时候app crash的时候会看到类似如下的信息，除此之外就再也没有其他信息了
MyApp [4413:40b] -[UIImage isKindOfClass]: message sent to deallocated instance 0x4dbb170
这时候的错误定位方法如下：
－ 使用gdb调试时，在debug窗口输入：info malloc-history 0x4dbb170（这里写已经dead的内存地址
－ 使用lldb调试［此方法仅适用于模拟器调试，需要勾选scheme中Malloc Stack选项］，打开terminal，su权限（没su权限可能会报错）
   输入：malloc_history 4413 0x4dbb170 //4413是这个app的进程pid，在报错信息中能找到MyApp [4413:40b]

输入以上语句之后会产生一系列log如下：（很多不用看直接跳到213行
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
malloc_history Report Version:  2.0

croath

#pragma mark -
#pragma mark UIWebViewDelegate Methods

- (BOOL)           webView:(UIWebView *)webView
shouldStartLoadWithRequest:(NSURLRequest *)request
            navigationType:(UIWebViewNavigationType)navigationType
{
    if (_sessionChecked) {
        [self log:@"session already checked."];
        return YES;

croath

- (void)clearCookies{
  NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
  for (NSHTTPCookie *each in cookieStorage.cookies) {
    if ([[[each properties] objectForKey:NSHTTPCookieDomain] isEqualToString:@".douban.com"] &&
        [[[each properties] objectForKey:NSHTTPCookieName] isEqualToString:@"bid"]) {
        [cookieStorage deleteCookie:each];
        NSDictionary* dic = [each properties];
        [dic setValue:@"" forKey:NSHTTPCookieValue];
        NSHTTPCookie* cookie = [NSHTTPCookie cookieWithProperties:dic];
        [cookieStorage setCookie:cookie];

croath

关于Objective-C warning的笔记。

关于deprecated方法

在开发（重构）中会遇到需要更新、替换、方法的时候，这时候就需要deprecated标签来表明已经废弃的方法。

举例说明：

croath

Only available in iOS 5.x

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General&path=Restrictions"]];

prefs:root=General&path=About
prefs:root=General&path=ACCESSIBILITY
prefs:root=AIRPLANE_MODE
prefs:root=General&path=AUTOLOCK
prefs:root=General&path=USAGE/CELLULAR_USAGE

prefs:root=Brightness

croath

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_5_0

//awesome! need to check usr/include/AvailabilityInternal.h

croath

history | awk '{CMD[$2]++;count++;}END { for (a in CMD)\
print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" \
| column -c3 -s " " -t | sort -nr | nl | head -n10

croath

require 'fileutils'

class String
  def numeric?
    return true if self =~ /^\d+$/
    true if Float(self) rescue false
  end
end

def remove_app (app_name)

croath

- (NSArray*)findAllLabelsOfView:(UIView*)view{
    NSMutableArray *array = [NSMutableArray array];
    NSArray *subViews = view.subviews;
    if ([view isKindOfClass:[UILabel class]]) {
        [array addObject:view];
    }
    if (subViews.count) {
        [subViews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            [array addObjectsFromArray:[self findAllLabelsOfView:obj]];
        }];

croath

var mc:CUnsignedInt = 0
var mlist:UnsafePointer<Method> = class_copyMethodList(UIImageView.classForCoder(), &mc);
println("\(mc) methods")
        
for var i:CUnsignedInt = 0; i < mc; i++ {
  println("Method #\(i): \(sel_getName(method_getName(mlist.memory)))")
  mlist = mlist.succ()
}