- 可以批量修改光标所在位置的变量 control + command + e
- 界面左侧的项目导航栏中显示当前文件command + shift + j
- UITextField系统自带边框
//设置边框样式
//UITextBorderStyleRoundedRect-圆角矩形，背景是白色，不再是透明的
//UITextBorderStyleLine-矩形，黑色边框，透明背景
//UITextBorderStyleBezel-和上面类似，但是是灰色的边框，背景透明
textFiled.borderStyle=UITextBorderStyleRoundedRect;
- UITextView设置placeholder
KVC键值编码，对UITextView的私有属性进行修改(系统版本8.3以上)
UILabel *placeholderLabel = [[UILabel alloc]init];
placeholderLabel.text = @"请输入内容";
placeholderLabel.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
[textView addSubview:placeholderLabel];
[textView setValue:placeholderLabel forKeyPath:@"placeholderLabel"];
- 修改UISearBar内部背景，placeholder颜色
KVC键值编码
UITextField * searchField = [_searchBar valueForKey:@"_searchField"];
textField.backgroundColor = [UIColor redColor];
[searchField setValue:[UIColor lightGrayColor] forKeyPath:@"_placeholderLabel.textColor"];
[searchField setValue:[UIFont boldSystemFontOfSize:12]forKeyPath:@"_placeholderLabel.font"];
6.是否包含字符串(不区分大小写)
localizedCaseInsensitiveContainsString
- UIView设置部分圆角
CGRect rect = view.bounds;
CGSize radio = CGSizeMake(30, 30);//圆角尺寸
UIRectCorner corner = UIRectCornerTopLeft|UIRectCornerTopRight;//这只圆角位置
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:corner cornerRadii:radio];
CAShapeLayer *masklayer = [[CAShapeLayer alloc]init];//创建shapelayer
masklayer.frame = view.bounds;
masklayer.path = path.CGPath;//设置路径
view.layer.mask = masklayer;
- dispatch_semaphore信号量
//创建信号量，参数：信号量的初值，如果小于0则会返回NULL
dispatch_semaphore_create（信号量值）
//等待降低信号量
dispatch_semaphore_wait（信号量，等待时间）
//提高信号量
dispatch_semaphore_signal(信号量)
dispatch_queue_t workConcurrentQueue = dispatch_queue_create("cccccccc", DISPATCH_QUEUE_CONCURRENT);
dispatch_queue_t serialQueue = dispatch_queue_create("sssssssss",DISPATCH_QUEUE_SERIAL);
dispatch_semaphore_t semaphore = dispatch_semaphore_create(2);
for (NSInteger i = 0; i < 10; i++) {
dispatch_async(serialQueue, ^{
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
dispatch_async(workConcurrentQueue, ^{
NSLog(@"thread-info:%@开始执行任务%d",[NSThread currentThread],(int)i);
sleep(1);
NSLog(@"thread-info:%@结束执行任务%d",[NSThread currentThread],(int)i);
dispatch_semaphore_signal(semaphore);
});
});
}
NSLog(@"主线程...!");
- objc_property_t反射
//objc_property_t：表示类对象中的全局属性，即用@property定义的属性
//动态获取一个自定义类对象中的所有属性
- (NSDictionary *)allProperties
{
NSMutableDictionary *props = [NSMutableDictionary dictionary];
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList([self class], &outCount);
for (i = 0; i<outCount; i++)
{
objc_property_t property = properties[i];
const char *char_f =property_getName(property);
NSString *propertyName = [NSString stringWithUTF8String:char_f];
id propertyValue = [self valueForKey:(NSString *)propertyName];
if (propertyValue)
[props setObject:propertyValue forKey:propertyName];
}
free(properties);
return props;
}
- runtime之Ivar
//Ivar:表示类对象中的所有定义的全局变量
//获取类的成员变量名
+ (NSArray *)getVariableNamesByObject:(id)object
{
unsigned int numIvars = 0;
//获取类的所有成员变量
Ivar * ivars = class_copyIvarList([object class], &numIvars);
//定义一个数组来接收获取的属性名
NSMutableArray *nameArray = [[NSMutableArray alloc] initWithCapacity:numIvars];
for(int i = 0; i < numIvars; i++) {
//得到单个的成员变量
Ivar thisIvar = ivars[i];
//得到这个成员变量的类型
const char *type = ivar_getTypeEncoding(thisIvar);
NSString *stringType = [NSString stringWithCString:type encoding:NSUTF8StringEncoding];
//此处判断非object-c类型时跳过
if (![stringType hasPrefix:@"@"]) {
continue;
}
//得到成员变量名
NSString *variableName = [NSString stringWithUTF8String:ivar_getName(thisIvar)];
[nameArray addObject:variableName];
//这个函数可以得到成员变量的值
//object_getIvar(object, thisIvar)
}
free(ivars);
return nameArray;
}
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