- 忽略警告
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "相关命令"
// 这是是出现警告的代码
#pragma clang diagnostic pop
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常见的命令有
1.方法废弃
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
//废弃的方法
#pragma clang diagnostic pop
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2.不兼容指针类型
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wincompatible-pointer-types"
//
#pragma clang diagnostic pop
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3.未使用变量
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-variable"
int a;
#pragma clang diagnostic pop
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4.
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[observer performSelector:selector withObject:notification];
#pragma clang diagnostic pop
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如果需要每个属性或每个方法都去指定nonnull和nullable，是一件非常繁琐的事。苹果为了减轻我们的工作量，专门提供了两个宏:
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NS_ASSUME_NONNULL_BEGIN
NS_ASSUME_NONNULL_END
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