Xcode常见警告汇总(持续更新)

Update to recommended settings

原因：Xcode所支持的iOS版本大于工程设置的版本。

点击警告，弹出如下提示，为所有项目升级Target和Project升级版本。



或是直接在在此处逐一进行修改

Precompiled header uses DATE or TIME

解决方法：

https://github.com/ibireme/YYKit/issues/152

warning: multi-character character constant [-Wfour-char-constants]

解决方法：

http://stackoverflow.com/questions/7459939/what-do-single-quotes-do-in-c-when-used-on-multiple-characters

Comparison of integers of different signs: ‘int’ and ‘NSUInteger’ (aka ‘unsigned long’)

使用数组的,count属性的时候容易出这个问题。

for (int j = 0 ; j < [emotions count]; j++) {

}

由于数组索引不可能为负数，所以count是一个无符号整形，j是一个有符号整形。类型没有同意所以出现异常,同时， NSInteger在64位上是long 在32位上是int所以还是使用long比较保险，不会出现溢出情况。

for (unsigned long  j = 0 ; j < [emotions count]; j++) {
}

参考地址：

http://stackoverflow.com/questions/8350971/comparison-of-integers-of-different-signs-warning-with-xcode

Implementing deprecated method

使用了Object-C垃圾回收器不支持的方法

Objective-C garbage collection is no longer supported.

Method override for the designated initializer of the superclass ‘-init’ not found

reason：

The designated initializer guarantees the object is fully initialised by sending an initialization message to the superclass. The implementation detail becomes important to a user of the class when they subclass it. The rules for designated initializers in detail:

A designated initializer must call (via super) a designated initializer of the superclass. Where NSObject is the superclass this is just [super init].

Any convenience initializer must call another initializer in the class - which eventually leads to a designated initializer.

A class with designated initializers must implement all of the designated initializers of the superclass.

解决方法：

example:

@interface MyClass : NSObject
@property(copy, nonatomic) NSString *name;
-(instancetype)initWithName:(NSString *)name NS_DESIGNATED_INITIALIZER;
-(instancetype)init;
@end
/**
then the compiler checks if the (convenience) initializer init calls the (designated) initializer initWithName:, so this would cause a warning:
*/
-(instancetype)init
{
self = [super init];
return self;
}
//and this would be OK:

-(instancetype)init
{
self = [self initWithName:@""];
return self;
}

http://stackoverflow.com/questions/32741123/objective-c-warning-method-override-for-the-designated-initializer-of-the-superc

http://stackoverflow.com/questions/26185239/ios-designated-initializers-using-ns-designated-initializer

Bitmasking for introspection of Objective-C object pointers is strongly discouraged

苹果不推荐用于内省Objective-C对象指针的位掩码运算

解决方法：某数字& 0x1的时候是代表要取最低位是否为1，把

(JK_EXPECT_F(((NSUInteger)object) & 0x1))

改成了

(JK_EXPECT_F(((NSUInteger)object)%2))

即可。

5enumeration values not handled in switch: ‘…

枚举里面的所有类型在switch里面并没有全部的对应起来。如果并不是都需要使用，最好是把所有的情况都补全。如果确实不需要所有功能，也应该在下面default break里面补全并打印LOG.

typedef NS_ENUM(NSInteger,AnimalName){
Dog,
Cow,
Hen,
Cat,
Pig
};

下面的情况会出现警告

AnimalName animalName = Pig;
switch (animalName) {
case Dog:

break;
case Hen:

break;
}

添加Default警告消失

AnimalName animalName = Pig;
switch (animalName) {
case Dog:
break;
case Hen:
break;

default:
NSLog(@"animalName is %ld",animalName);
break;
}

Assigning to ‘id _Nullable’ from incompatible type ‘OLLiveGiftView *const __strong’

在10.0的API中，CAAnimationDelegate变成了协议。而在iOS10以前则是以分类的形式。

iOS 9.3的代码

@property(nullable, strong) id delegate;

/* When true, the animation is removed from the render tree once its
* active duration has passed. Defaults to YES. */

@property(getter=isRemovedOnCompletion) BOOL removedOnCompletion;

@end

/* Delegate methods for CAAnimation. */

@interface NSObject (CAAnimationDelegate)

/* Called when the animation begins its active duration. */

- (void)animationDidStart:(CAAnimation *)anim;

/* Called when the animation either completes its active duration or
* is removed from the object it is attached to (i.e. the layer). 'flag'
* is true if the animation reached the end of its active duration
* without being removed. */

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag;

@end

iOS10.0的代码

@property(nullable, strong) id <CAAnimationDelegate> delegate;

/* When true, the animation is removed from the render tree once its
* active duration has passed. Defaults to YES. */

@property(getter=isRemovedOnCompletion) BOOL removedOnCompletion;

@end

/* Delegate methods for CAAnimation. */

@protocol CAAnimationDelegate <NSObject>
@optional

/* Called when the animation begins its active duration. */

- (void)animationDidStart:(CAAnimation *)anim;

/* Called when the animation either completes its active duration or
* is removed from the object it is attached to (i.e. the layer). 'flag'
* is true if the animation reached the end of its active duration
* without being removed. */

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag;

@end

修改方法就是在类的实现里面添加协议就好。

@implementation ViewController<CAAnimationDelegate>

is deprecated: first deprecated in XXX

解决方法：方法过期使用新方法

Values of type ‘NSInteger’ should not be used as format arguments; add an explicit cast to ‘long’ instead

解决办法

[NSString stringWithFormat:@“%ld", (long)number];

接入第三方SDK异常

接入新浪微博，微信等异常，Error OSStatus -10814 ，Error 308

-canOpenURL: failed for URL: "weixin://app/wx368afdba2d19c1fa/" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.010672 MYDemo[1747:940399] -canOpenURL: failed for URL: "wtloginmqq2://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.011959 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqopensdkapiV3://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.013144 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqwpa://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.014703 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqopensdkapiV2://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.015940 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqOpensdkSSoLogin://qqapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.017359 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqq://qqapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.018724 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqzoneopensdkapiV2://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.020263 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqzoneopensdkapi19://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.021645 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqzoneopensdkapi://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.023895 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqzoneopensdk://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.025568 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqzone://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.026643 MYDemo[1747:940399] -canOpenURL: failed for URL: "wtloginmqq2://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.027799 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqopensdkapiV3://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.029189 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqwpa://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.032464 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqopensdkapiV2://qzapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.034013 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqqOpensdkSSoLogin://qqapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.035385 MYDemo[1747:940399] -canOpenURL: failed for URL: "mqq://qqapp" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.067138 MYDemo[1747:940399] -canOpenURL: failed for URL: "sinaweibo://" - error: "未能完成操作。（“OSStatus”错误 -10814。）"
2016-11-22 14:54:24.068271 MYDemo[1747:940399] -canOpenURL: failed for URL: "sinaweibohd://" - error: "未能完成操作。（“OSStatus”错误 -10814。）"

可以到

https://www.osstatus.com/search/results?platform=all&framework=all&search=-10814%23 查询对应的原因

解决方法：http://stackoverflow.com/questions/38689631/how-to-use-facebook-ios-sdk-on-ios-10